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PubMed1996

Genetic analysis of sex and generation differences in plasma lipid, lipoprotein, and apolipoprotein levels in adolescent twins and their parents.

In a sample of Dutch families consisting of parents aged 35-65 years and their twin offspring aged 14-21 years, a significant difference between generations was observed in phenotypic variances and in genetic heritabilities for plasma levels of total cholesterol, triglycerides, high density lipoprotein (HDL) and low density lipoprotein (LDL) cholesterol, and apolipoproteins (apo) A1, A2, B, and E. For all traits parents were more variable than their offspring. This increase in phenotypic variance was best explained by a genetic model in which individual specific environmental variance increased with increasing age. Genetic variance was the same across generations for nearly all traits except triglycerides and apoE, for which a decrease in genetic variance was observed. This model led to large intergenerational differences in genetic heritabilities. Heritabilities for children were between 65 and 87%, while heritabilities for their parents were between 10 and 50%. No evidence was found for effects of a shared family environment.

Adolescent↗
PubMed1994

Immigrant skills and ethnic spillovers.

"This paper investigates the hypothesis that ethnicity has spillover effects on the human capital accumulation process. It extends previous research by documenting the extent to which the relative importance of parental inputs and ethnic spillovers in the intergenerational transmission of skills differs both within and across immigrant and U.S.-born ethnic groups. Using data drawn from the General Social Surveys, the study documents that the second and third generations (i.e., the children and grandchildren of immigrants) experience relatively more rapid economic advancement than do other generations, and that ethnic spillovers play a stronger role in households which are at the extremes of the skill distribution."

Americas↗
PubMed2002

Inhibitory effect of a high-molecular-weight constituent of cranberry on adhesion of oral bacteria.

A high-molecular-weight nondialysable material (NDM) isolated from cranberry juice at a concentration of 0.6 to 2.5 mg/ml dissociated coaggregates formed by many intergeneric oral bacteria. A lower concentration of NDM was required to inhibit formation of such coaggregates. NDM acted preferentially on pairs of oral bacteria in which one or both members are Gram-negative anaerobes. The high-molecular-weight material from blueberry also inhibited the coaggregation, although its activity was weaker, whereas such materials obtained from other fruits were inactive. Saliva did not interfere with the ability of NDM to inhibit coaggregation. A preliminary clinical trial showed that NDM reduces S. mutans counts in saliva. The antiadhesion activity of cranberry juice has a potential for altering the oral microbial flora resulting in improved oral hygiene.

Bacterial Adhesion↗
PubMed1992

Children and pensions.

"Recent economic explanations of changes in fertility behaviour have focussed on the effects of labour-market-related incentives. The present paper draws attention to another set of incentives, those connected with the transfer of resources over time. The theoretical implications of intergenerational altruism as a possible motive for having children and making transfers to them are considered, and contrasted with those arising from the competing hypothesis that such actions are motivated by old-age-security considerations. From a comparison of these theoretical predictions with the findings of a number of empirical studies, it would appear that self-interested concern for one's old age, rather than any great love for future members of one's dynasty, is or has been so far the dominant force driving fertility and intergenerational transfers worldwide."

Behavior↗
PubMed2003

Maternal power assertion in discipline and moral discourse contexts: commonalities, differences, and implications for children's moral conduct and cognition.

Parental power assertion is traditionally studied in the behavioral domain--discipline triggered by the child's immediate misbehavior--but rarely in the cognitive domain--parent-child discussions of the child's past misbehavior. Maternal power assertion was observed in "do" and 'don't" discipline contexts from 14 to 45 months and in the context of mother-child discourse about a recent misbehavior at 56 months. Mothers' use of power cohered across the "do," 'don't," and discourse contexts, but its implications were domain specific. Power assertion in the 'don't" discipline context predicted behavioral outcomes (more moral conduct at 56 and 73 months, less antisocial conduct at 73 months) but not cognitive outcomes (moral cognition at 56 and 73 months). Power assertion in the discourse context predicted less mature moral cognition but not moral or antisocial conduct. Mothers' high Neuroticism predicted more power assertion in all three contexts. Child effects were examined.

Adult↗
PubMed1986

The changing economy and the family.

This study is concerned with the impact of changes in economic conditions on the family. "Three issues are considered in this paper. First, the reasons why the family is not fading away as an economic entity are discussed. The argument of this paper is that, despite the declines in various economic functions of the family and the increases in divorces and in other failures, the survival capacity of the family is both strong and robust." Second, the author contends that the economic approach should be extended to deal with the effects of the life-span revolution, shifts in prices and incomes, and the ability of the family to cope with these changes. Third, the hypothesis is put forward that intergenerational transfers are less important than increases over time in real per capita incomes and changes in income composition, its permanent and temporary components, and the sources of income. The geographical focus is worldwide.

Costs and Cost Analysis↗
PubMed1997

Geographic distance and contact between middle-aged children and their parents: the effects of social class over 20 years.

This research derives and tests hypotheses from two alternative conceptual models: the modified extended family model, and the changing family constraints model, which takes into account recent changes in work and family life. The hypotheses address social class differences in geographic distance and contact frequency between middle-aged children and their parents over time. Simultaneous probit models are used to analyze distance and contact as jointly determined outcomes with data from the USC Longitudinal Study of Generations and Mental Health. Results from these analyses indicate that children's 1971 educational aspirations and social class positions predict 1991 distance and contact between generations. Parents who have lower 1991 incomes, however, live farther from children and talk with them on the telephone less frequently than higher-income parents. Thus, the effects of early social class position support the modified extended family model, whereas the effects of current social class position support the changing family constraints model.

Communication↗
PubMed1983

Alignment of genetic and restriction maps of the photosynthesis region of the Rhodopseudomonas capsulata chromosome by a conjugation-mediated marker rescue technique.

The restriction map of a 46-kilobase fragment of the Rhodopseudomonas capsulata chromosome was aligned with the genetic map of the photosynthesis region of that chromosome by a marker rescue technique. Marker rescue was effected by mobilization of vectors bearing fragments of R. capsulata DNA from Escherichia coli to a set of R. capsulata mutants. Plasmids pDPT51 and pDPT55 were constructed to mediate the intergeneric mobilization of pBR322 derivatives, and a mutant of R. capsulata with improved intergeneric recipient activity was isolated. Four previously unmapped genes affecting bacteriochlorophyll synthesis and two genes affecting photochemical reaction center synthesis have been located by marker rescue. Some of the fragments of R. capsulata DNA are capable of vector-independent complementation, implying that promoters are located on these fragments. Other fragments complement only in one orientation of insertion in the vector, implying transcription from promotors on the vectors and thereby fixing the direction of transcription for those fragments. Still other fragments of DNA show rescue only via recombination between homologous plasmid-borne DNA fragments and chromosomal mutations. The physical dimensions of the genetic map are 3.0 megadaltons per map unit, which agrees with previous estimates based on the size of the R. capsulata gene transfer agent.

Bacterial Proteins↗
PubMed1990

Transfers to the old, government debt and demographic change.

"In this paper we take the view that policy makers...take the relationship between (explicit) intergenerational transfer systems (including public pension schemes) and government deficits into account. It is assumed that policy makers are behaving altruistically towards past and future generations. Given the behavioral model, an analysis is made of the effects of demographic changes (such as the 'baby-boom' of the 1940s and 1950s and the decline of birth rates in the 1970s) on the decisions to be taken with respect to the tax rate of the public pension system and the size of government debt. From the analysis it appears that, with the assumption of altruistic decision-makers, periods of increasing or decreasing debt can occur alternately in periods of demographic change." The geographical focus is on developed countries.

Behavior↗
PubMed2000

Menopause and the transmission of women's knowledge: African American and white women's perspectives.

Recent menopause literature does not sufficiently explore women's attitudes on the transmission of knowledge about menopause from sources other than biomedical providers. Analysis of 70 interviews with African American and Euro-American women shows that their perceptions of the intergenerational transfer of knowledge about menopause from their mothers shaped their attitudes toward menopause and the health-care technologies surrounding it. African American women who grew up in the segregated South frequently expressed that their mothers provided them with the knowledge and power to negotiate difficulties during the menopausal process, while many middle-class Euro-American women expressed that their mothers did not. Drawing on literature that examines the effects of race, class, and kinship on mother/daughter relationships, this article explores the reasons for this divergence.

Adaptation, Psychological↗
PubMed1997

An intergenerational program for persons with dementia using Montessori methods.

An intergenerational program bringing together older adults with dementia and preschool children in one-on-one interactions is described. Montessori activities, which have strong ties to physical and occupational therapy, as well as to theories of developmental and cognitive psychology, are used as the context for these interactions. Our experience indicates that older adults with dementia can still serve as effective mentors and teachers to children in an appropriately structured setting.

Aged↗
PubMed2002

Long-term effects of child punishment on Mexican women: a structural model.

OBJECTIVE: The aim of this study was to investigate long-term effects of parental use of physical and verbal punishment on Mexican women. To study both direct and indirect effects of these phenomena, a structural model was developed and tested. METHOD: One hundred and fifty Mexican women were interviewed with regard to their history of child abuse, their level of depression, alcohol use, antisocial behavior, and punishment of their own children. Factors representing such constructs were specified within a structural equation model and their inter-relations were estimated. Women's history of abuse was considered as an exogenous latent variable directly affecting three other factors: mothers' antisocial behavior, their alcohol consumption, and their levels of depression or anxiety. These factors, in turn, were specified as influencing mothers' harsh discipline of their own children. RESULTS: Data supported this model, indicating that a history of abuse has long-term effects on women's behavior and psychological functioning, which in turn cause women's punitive behavior against their children. CONCLUSIONS: These results are discussed in terms of the theoretical framework of intergenerational transmission of violence. The direct consequences (depression, anxiety, alcohol consumption, and antisocial behavior) of child punishment act as risk factors for the next generation of child abuse.

Adult↗
PubMed1996

Population biology of human aging: segregation analysis of bone age characteristics.

The main goal of the present study is to elucidate the extent to which primary characteristics of bone aging are determined by major gene effects. We report the results of a complex segregation analysis of bone mineral density (BMD) and osseographic score (OS) carried out on an array of pedigrees from rural Turkmenia. Both variables showed a significant correlation with age and thus were adjusted. However, the correlations with body height, weight, body mass index, and obesity indexes were negligible. The results of the segregation analysis performed on BMD clearly indicate major gene effects on BMD variation. The Mendelian transmissibility hypothesis with two codominant alleles was chosen as the best-fitting and most parsimonious model. Under this hypothesis 50-60% of total variation in BMD, depending on bone area, can be attributed to a major gene effect, and the frequency of the allele determining the higher value of bone density is between 30% and 38% in the Turkmenian population. Regarding the OS, segregation analysis provided evidence supporting intergenerational transmissibility of this characteristic and yet the Mendelian model was rejected.

Adolescent↗
PubMed2001

Intergenerational transmission of abuse: a two-generational prospective study of an at-risk sample.

OBJECTIVE: A model was examined in which the association between a parent's history of abuse and the parent's own abusive behavior toward his or her children was hypothesized to be mediated by parental psychopathology, early childbearing, and consistency of discipline. Additionally, the effect of severity of abuse on the likelihood of becoming abusive was examined. METHOD: Participants were 109 parents (G1) and their male children (G2) who were involved in a longitudinal study. The G1 parents reported on their own experiences of abuse when they were children. Ten years later, the G2 youths reported on the G1 parents' abusive behavior toward them. A number of other factors, including parental socioeconomic status (SES), antisocial behavior, depression and Post-traumatic Stress Disorder (PTSD), consistency of discipline, and the perceived early difficulty of the G2 children were measured. RESULTS: As reported by their own children, parents who reported having been abused in childhood were significantly more likely to engage in abusive behaviors toward the next generation. Findings indicated that abuse experienced by the parents, as well as consistency of discipline and depression plus PTSD, were predictive of parental abuse of the child. Contrary to hypotheses, the effects were not fully mediated. However, there were significant interactions between parental history of abuse and consistency of discipline, as well as abuse history and depression and PTSD. Parents who had experienced multiple acts of abuse and at least one physical impact were more likely to become abusive than were the other parents. CONCLUSIONS: The implications of these findings for preventive interventions are discussed.

Adult↗
PubMed2003

Theoretical and methodological considerations in cross-generational research on parenting and child aggressive behavior.

The four studies in this special issue represent important advances in research on the intergenerational transmission of aggressive behavior. In this commentary, we review the key features and findings of these studies, as well as our own cross-generational study of aggression, the Columbia County Longitudinal Study. Next, we consider important theoretical issues (e.g., defining and operationalizing "aggression" and "parenting"; assessing reciprocal effects of parenting and child aggression; identifying the ages at which aggression should be assessed across generations; broadening the investigation of contextual and individual factors). We then discuss several methodological issues (e.g., determining the most informative measurement intervals for assessing prospective effects; sampling considerations; measuring potential moderating and mediating variables that might explain cross-generational continuities and discontinuities in parenting and aggression). Finally, we raise implications of cross-generational research for designing interventions targeting the reduction and prevention of child aggression.

Adolescent↗
PubMedDate not supplied

Is the relationship between fertility of parents and children really weak?

The relationship between fertility of parents and children has been designated as "weak" by most investigators. This paper reviews the evidence over the past century and argues that, even allowing for problems with available data sources, the relationship was probably close to zero for pre-transitional populations. However, over time, the relationship has tended to become more substantial and is now of a similar order of magnitude in developed countries as other widely used explanatory variables. Possible mechanisms for the observed relationship are discussed, especially the roles of socialization and inherited factors. The types of data used are compared to the scientific questions posed, and the limitations of the common comparison of married-mother/married-daughter pairs are considered. Finally, some evidence from recent large-scale surveys in Britain and the United States is presented to show changes over recent periods and the relative effects of sibship size of fathers and mothers.

Adult↗