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Biomedical subjects

J Barling

Publications and source records attributed to J Barling.

At least 19 recordsLinked to original sources
PubMed2004

Molybdenum isotope evidence for widespread anoxia in mid-Proterozoic oceans.

How much dissolved oxygen was present in the mid-Proterozoic oceans between 1.8 and 1.0 billion years ago is debated vigorously. One model argues for oxygenation of the oceans soon after the initial rise of atmospheric oxygen approximately 2.3 billion years ago. Recent evidence for H(2)S in some mid-Proterozoic marine basins suggests, however, that the deep ocean remained anoxic until much later. New molybdenum isotope data from modern and ancient sediments indicate expanded anoxia during the mid-Proterozoic compared to the present-day ocean. Consequently, oxygenation of the deep oceans may have lagged that of the atmosphere by over a billion years.

Journal Article↗
PubMed2001

Precise determination of mass-dependent variations in the isotopic composition of molybdenum using MC-ICPMS.

We present an analytical approach for the precise determination of mass-dependent differences in the isotopic composition of Mo between samples and reference standards using multiple-collector magnetic sector inductively coupled plasma mass spectrometry (MC-ICPMS). Either Zr or Ru "element spikes" are employed to correct for instrumental mass bias. Differences in 95Mo/97Mo can be determined to a precision of +/-0.2%o (+2sigma) using 1-10 microg of Mo. Similar precision is possible for other ratios after correction for isobaric interferences from either spike element. This approach facilitates study of mass-dependent variations in the isotopic composition of Mo in nature and in materials produced by laboratory processes. We observe fractionation of Mo isotopes of approximately 1.5%o/amu during ion-exchange chromatography in the laboratory and a shift of approximately 0.3%o/amu between natural MoS2 and a laboratory standard.

Journal Article↗
PubMed2001

Drowning not waving: burnout and mental health nursing.

Mental health nursing as one of the human services professions has frequently, been associated with stress and burnout. The three dimensions of burnout; emotional exhaustion, depersonalisation and reduced personal accomplishment have major implications for the quality of the service that mental health nurses are capable of giving. Various studies have demonstrated mental health nurses suffer a high degree of burnout. Other studies have identified the stressors associated with mental health nursing that may be precursors to burnout. The Evaluation of the National Mental Health Strategy (1998) demonstrated that the Strategy was achieving many of its objectives. The objectives that have been achieved in service delivery have produced a work environment that has many of the identified stressors associated with burnout. Therefore, it is imperative that strategies are implemented that address the problem of stress and burnout in the current mental health system.

Australia↗
PubMed2001

Behind closed doors: in-home workers' experience of sexual harassment and workplace violence.

The authors developed and tested a structural model predicting personal and organizational consequences of workplace violence and sexual harassment for health care professionals who work inside their client's home. The model suggests that workplace violence and sexual harassment predict fear of their recurrence in the workplace, which in turn predicts negative mood (anxiety and anger) and perceptions of injustice. In turn, fear, negative mood, and perceived injustice predict lower affective commitment and enhanced withdrawal intentions, poor interpersonal job performance, greater neglect, and cognitive difficulties. The results supported the model and showed that the associations of workplace violence and sexual harassment with organizational and personal outcomes are indirect, mediated by fear and negative mood. Conceptual implications for understanding sexual harassment and workplace violence, and future research directions, are suggested.

Adult↗
PubMed2000

Nonbiological fractionation of iron isotopes.

Laboratory experiments demonstrate that iron isotopes can be chemically fractionated in the absence of biology. Isotopic variations comparable to those seen during microbially mediated reduction of ferrihydrite are observed. Fractionation may occur in aqueous solution during equilibration between inorganic iron complexes. These findings provide insight into the mechanisms of iron isotope fractionation and suggest that nonbiological processes may contribute to iron isotope variations observed in sediments.

Chemical Fractionation↗
PubMed1999

Parents' job insecurity affects children's grade performance through the indirect effects of beliefs in an unjust world and negative mood.

The authors postulated a model in which children's perceptions of their parents' job insecurity indirectly affect their grade performance through the effects of beliefs in an unjust world and negative mood. A total of 127 undergraduate students (55 male, 72 female) completed questionnaires on their perceptions of their parents' job insecurity and their own beliefs in an unjust world and negative mood. The parents reported on their own job insecurity. In addition, students provided their course grades from the previous semester 3 months after completing the questionnaires. Support for the proposed model was provided using LISREL 8.

Adolescent↗
PubMed1999

Parents' job insecurity affects children's academic performance through cognitive difficulties.

The authors developed and tested a model in which children who perceive their parents to be insecure about their jobs are distracted cognitively, which in turn affects their academic performance negatively. Participants were 102 female and 18 male undergraduates (mean age = 18 years), their fathers (mean age = 49 years), and their mothers (mean age = 47 years). Students completed questionnaires measuring perceived parental job insecurity, identification with parents, and cognitive difficulties; 3 months later, they also reported their midyear grades. Fathers and mothers each completed questionnaires assessing their job insecurity. Support for the model was obtained using LISREL 8, and as predicted, children's identification with their mothers and fathers moderated the relationship between their perceptions of their mothers' and fathers' job insecurity and their own cognitive difficulties.

Achievement↗
PubMed1999

Occupational health psychology: an emerging discipline.

There is growing concern that rapidly changing patterns of work organization and employment pose risk for occupational illness and injury. In the present article, we assert that these changes create new needs and opportunities for research and practice by psychologists in the area of work organization and health. We begin with an historical overview of the contribution of psychologists to the occupational safety and health field, and to the study of work organization and health. We then describe new initiatives by the American Psychological Association and national health organizations in the United States and Europe to frame a new field of study--called "occupational health psychology"--that focuses on the topic of work organization and health. We conclude with a discussion of emerging research needs and trends within this field.

Accidents, Occupational↗
PubMed1998

Effects of parents' job insecurity on children's work beliefs and attitudes.

The authors hypothesized that children's perceptions of their parents' job insecurity mediate the effects of parental job insecurity and layoffs on children's work beliefs and work attitudes. Male and female undergraduate students (N = 134; M age = 18.9 years), as well as their mothers (M age = 47.0 years) and fathers (M age = 49.1 years), participated voluntarily. With structural equation modeling as implemented by LISREL VIII, support for the proposed model was obtained, whereas no support was obtained for a competing model. Moreover, identification with fathers moderated the influence of perceived paternal job insecurity on children's humanistic work beliefs, but no comparable effect emerged for mothers.

Adult↗
PubMed1998

Personal and organizational predictors of workplace sexual harassment of women by men.

The authors investigated the predictors of workplace sexual harassment in 278 male university faculty and staff (M age = 45 years). Workplace variables (perceptions of organizational sanctions against harassment and perceptions of a sexualized workplace) and personal variables (adversarial sexual beliefs, sexual harassment beliefs, perspective taking, and self-esteem) were studied as predictors of sexualized and gender harassment. Social desirability was controlled. Both organizational variables and beliefs about sexual harassment predicted gender harassment and sexualized harassment. Perspective taking, adversarial sexual beliefs, and sexual harassment beliefs moderated the effects of perceived organizational sanctions against harassment on sexualized harassment. Findings are discussed as they relate to organizational efforts to reduce or prevent sexual harassment.

Adult↗
PubMed1996

Eldercare responsibilities, interrole conflict, and employee absence: a daily study.

A model was developed specifying that the number of hours employees spend providing care to or interacting with elderly parents predicts conflict between the roles of employee and caregiver. Interrole conflict was subsequently expected to predict partial absence from work (e.g., arriving late). Seventeen employed eldercare providers completed a daily questionnaire for 20 work days. The data were standardized and pooled, and the proposed model was tested by using structural equation modeling. The proposed model provided a good fit to the data. A competing model that added the direct effects of hours of interacting with and hours of providing care to parents on partial absence provided a significantly better fit. The potential impact of the findings on employees and organizations is discussed.

Absenteeism↗
PubMed1995

Predicting retirement anxiety: the roles of parental socialization and personal planning.

It was proposed that anxiety about retirement begins long before retirement, and that perceptions on one's parents' socialization into retirement and one's own planning for retirement are associated with retirement anxiety. Data from 213 Canadian respondents (mean age = 44 years) were analyzed. Path analysis indicated that both parental socialization and own planfulness affect retirement anxiety.

Adaptation, Psychological↗
PubMed1994

Predictors and outcomes of elder-care-based interrole conflict.

The authors propose and test a model of the predictors and outcomes of the role conflicts experienced by individuals simultaneously holding full-time employment and providing care for elderly parents. It is proposed that interrole conflict is predicted by physical and psychological involvement in elder care and predicts both partial absenteeism from work and psychological strain. In turn, psychological strain predicts marital interactions. Data from 141 full-time employees from 2 universities provided strong support for the proposed mediational model using LISREL VII. In contrast, 2 alternative models were not supported by the data.

Absenteeism↗
PubMed1993

Homemaker role experiences affect toddler behaviors via maternal well-being and parenting behavior.

A model delineating the relationship between homemakers' role experiences and toddler behavior was developed, and tested using path analysis. We proposed that the relationship between homemakers' role experiences (skill use, perceived financial equity, homemaking satisfaction, and role overload) and toddler's internalizing and externalizing behaviors is mediated by maternal psychological well-being (positive mood, negative mood, and cognitive difficulties) and parenting behavior (positive, punishing, and rejecting). Using confirmatory path analysis, the proposed model fit the data [Q = .73, W(34) = 47.4; p > .05] obtained from a sample of 187 homemakers. The results suggest that, as for employed mothers, it is important to understand how homemakers experience their role, because those experiences indirectly predict children's behavior.

Adult↗
PubMed1993

Linking retirement experiences and marital satisfaction: a mediational model.

The authors propose and test a mediational model linking the experience of retirement with marital satisfaction. The experience of retirement (financial strain, time structure, a sense of purposefulness, and interpersonal contacts) is held to predict marital satisfaction indirectly through its sequential effects on context-specific well-being (retirement-specific satisfaction with health, activities, and peers) and context-free well-being (depressive symptoms). Both this model and a revised model in which retirement satisfaction also exerted a direct effect on marital satisfaction were supported using structural equation modeling on data from 164 retirees (mean age = 69 years). An alternative model in which depressive symptoms assume a predictive rather than mediational role was not supported; cross-lagged regression analyses excluded the possibility that marital dissatisfaction resulted in depressive symptoms. The conceptual and practical implications of these findings are discussed.

Aged↗
PubMed1990

Type A behavior and marital dissatisfaction: disentangling the effects of achievement striving and impatience-irritability.

Previous research has documented an association between overall Type A behavior and marital dissatisfaction. The present study examines the nature of this relationship when a two dimensional approach to Type A behavior is adopted, and impatience-irritability and achievement striving are assessed separately. Subjects were 134 medical practitioners and specialists and their wives in South Africa. As predicted, husbands' impatience-irritability was associated with their own and their wives' marital dissatisfaction. However, neither their achievement striving nor global Type A behavior correlated with their own or their wives' marital dissatisfaction. The results are discussed in terms of the need for isolating the specific component of Type A behavior that is associated with marital dissatisfaction.

Achievement↗
PubMed1989

Prevalence and stability of physical aggression between spouses: a longitudinal analysis.

Community couples (N = 272) were assessed in a longitudinal study of early marriage. More women than men reported physically aggressing against their partners at premarriage (44% vs. 31%) and 18 months (36% vs. 27%). At 30 months, men and women did not report significantly different rates of aggression (32% vs. 25%). However, using either the self-report or the partner's report, the prevalence of aggression was higher for women than men at each assessment period. Modal forms of physical aggression for both men and women were pushing, shoving, and slapping. Conditional probability analyses indicated that the likelihood of physically aggressing at 30 months given that one had engaged in such aggression before marriage and at 18 months after marriage was .72 for women and .59 for men. Furthermore, 25-30% of the recipients of physical aggression at all three assessment periods were seriously maritally discordant at 30 months.

Adult↗