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Gautun H, Bratt C. Caring for older parents in Norway - How does it affect labor market participation and absence from work? Soc Sci Med 2024; 346:116722. [PMID: 38498960 DOI: 10.1016/j.socscimed.2024.116722] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2023] [Revised: 01/25/2024] [Accepted: 02/23/2024] [Indexed: 03/20/2024]
Abstract
As the population ages, younger generations will increasingly be called upon to provide informal care to their aging parents. To prepare for this development, it is essential to understand how employees combine the dual responsibilities of work and caring for aging parents. By analyzing data collected in Norway in 2022 from a nationally representative sample of 6049 respondents, aged 35 to 67, we investigated how caring for older parents affects labor market participation and work absence. We provide descriptive statistics and conduct analyses with structural equation modeling. These analyses indicated that caregiving had no substantial impact on overall participation in the workforce. However, employees did use work absences to assist their parents. We differentiate between using holidays, compensatory time, and three types of formal leave: paid, unpaid, and sick leave. More than a third of the formal leave was taken as sick leave. Women were moderately more likely to use work absence to care for their parents. We conclude that caregiving for older parents currently has little effect on work participation in Norway and attribute the favorable situation in Norway to its comprehensive public elderly care system. However, a contributing factor is Norway's generous sick leave policy. Although intended for use when employees are sick themselves, sick leave is used by employees to provide care to aging parents. Sick leave seems to act as a safety valve. To mitigate the effects of informal care on work participation, welfare states may create conditions that allow employees to combine work and informal care without resorting to unauthorized sick leave. A solution could be to extend the existing support scheme for employees with young children to those providing care for their aging parents.
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Affiliation(s)
- Heidi Gautun
- Norwegian Social Research - NOVA, Department of Ageing Research and Housing Studies, Oslo Metropolitan University, Stensberggata 26, 0170 Oslo, Norway.
| | - Christopher Bratt
- Department of Psychology, Inland Norway University of Applied Sciences, Vormstuguvegen 2, 2624, Lillehammer, Norway; School of Psychology, University of Kent, Canterbury, UK.
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Gautun H, Bratt C, Billings J. Nurses' experiences of transitions of older patients from hospitals to community care. A nation-wide survey in Norway'. Health Sci Rep 2020; 3:e174. [PMID: 32695886 PMCID: PMC7365956 DOI: 10.1002/hsr2.174] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2020] [Accepted: 05/12/2020] [Indexed: 11/30/2022] Open
Abstract
Moving older patients from hospitals to community services is a critical phase of integrated care. Yet there has been little large-scale research on the quality of these transitions. We investigated how Norwegian nurses working in community care services (N = 4312) and at in-patient wards at hospitals (N = 2421) experienced the quality of transitions of older patients from hospitals to community care. We tested hypotheses derived from qualitative research and consistent with predictions, we found that compared to hospital nurses, the nurses working in community care experienced lower quality of patient transitions and were less satisfied with information exchange on patients' condition and needs. Further, when comparing groups of community nurses, we confirmed the hypothesis that nurses in home nursing were more dissatisfied with the quality of transitions and information exchange than nurses in nursing homes. We conclude that hospital nurses should have more face-to-face or telephone contact with community nurses, and specifically with home nurses. Further, we suggest that means are implemented to promote a mutual understanding of the older patients' pathway from one service to the other, and to improve co-ordination across the services.
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Affiliation(s)
- Heidi Gautun
- Norwegian Social Research (NOVA)Oslo Metropolitan UniversityOsloNorway
| | - Christopher Bratt
- School of Psychology – Keynes CollegeUniversity of KentCanterburyUK
- Department of PsychologyInland School of Business and Social Sciences, Inland Norway University of Applied Sciences – Lillehammer CampusLillehammerNorway
| | - Jenny Billings
- Integrated Care Research Unit, Centre for Health Service StudiesUniversity of KentCanterburyUK
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Bratt C, Abrams D, Swift HJ. Supporting the old but neglecting the young? The two faces of ageism. Dev Psychol 2020; 56:1029-1039. [PMID: 32105118 PMCID: PMC7144460 DOI: 10.1037/dev0000903] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2019] [Revised: 10/29/2019] [Accepted: 01/06/2020] [Indexed: 11/08/2022]
Abstract
Ageism is the most prevalent form of prejudice and is experienced by both older and younger people. Little is known about whether these experiences are interdependent or have common origins. We analyze data from 8,117 older (aged 70 and over) and 11,647 younger respondents (15-29 years) in representative samples from 29 countries in the European Social Survey. Using multilevel structural equation modeling, we test the hypothesis that older people are less likely, and younger people more likely, to suffer age discrimination if they live in a country with stronger structural support for older people. We also test the hypothesis that although stronger social norm against age discrimination reduce age discrimination suffered by older people it does not inhibit discrimination against younger people. These hypotheses are supported, and the results underline the neglected problem of ageism toward youth. Findings highlight that strategies for reducing age prejudice must address ageism as a multigenerational challenge, requiring attention to intergenerational cohesion and resource distribution between ages. (PsycInfo Database Record (c) 2020 APA, all rights reserved).
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Affiliation(s)
- Christopher Bratt
- Centre for the Study of Group Processes, School of Psychology, University of Kent
| | - Dominic Abrams
- Centre for the Study of Group Processes, School of Psychology, University of Kent
| | - Hannah J Swift
- Centre for the Study of Group Processes, School of Psychology, University of Kent
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Bratt C, Gautun H. Should I stay or should I go? Nurses’ wishes to leave nursing homes and home nursing. J Nurs Manag 2018; 26:1074-1082. [DOI: 10.1111/jonm.12639] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/04/2018] [Indexed: 11/30/2022]
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Bratt C, Abrams D, Swift HJ, Vauclair CM, Marques S. Perceived age discrimination across age in Europe: From an ageing society to a society for all ages. Dev Psychol 2018; 54:167-180. [PMID: 29058935 PMCID: PMC5819819 DOI: 10.1037/dev0000398] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2016] [Revised: 06/01/2017] [Accepted: 06/16/2017] [Indexed: 11/08/2022]
Abstract
Ageism is recognized as a significant obstacle to older people's well-being, but age discrimination against younger people has attracted less attention. We investigate levels of perceived age discrimination across early to late adulthood, using data from the European Social Survey (ESS), collected in 29 countries (N = 56,272). We test for approximate measurement invariance across countries. We use local structural equation modeling as well as moderated nonlinear factor analysis to test for measurement invariance across age as a continuous variable. Using models that account for the moderate degree of noninvariance, we find that younger people report experiencing the highest levels of age discrimination. We also find that national context substantially affects levels of ageism experienced among older respondents. The evidence highlights that more research is needed to address ageism in youth and across the life span, not just old adulthood. It also highlights the need to consider factors that differently contribute to forms of ageism experienced by people at different life stages and ages. (PsycINFO Database Record
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Affiliation(s)
- Christopher Bratt
- Centre for the Study of Group Processes, School of Psychology, University of Kent
| | - Dominic Abrams
- Centre for the Study of Group Processes, School of Psychology, University of Kent
| | - Hannah J Swift
- Centre for the Study of Group Processes, School of Psychology, University of Kent
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Swift HJ, Abrams D, Marques S, Vauclair CM, Bratt C, Lima ML. Agisem in the European Region: Finding from the European Social Survey. International Perspectives on Aging 2018. [DOI: 10.1007/978-3-319-73820-8_27] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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Vauclair CM, Lima ML, Abrams D, Swift HJ, Bratt C. What do older people think that others think of them, and does it matter? The role of meta-perceptions and social norms in the prediction of perceived age discrimination. Psychol Aging 2016; 31:699-710. [PMID: 27831711 PMCID: PMC5104248 DOI: 10.1037/pag0000125] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2015] [Revised: 07/22/2016] [Accepted: 08/04/2016] [Indexed: 11/24/2022]
Abstract
Psychological theories of aging highlight the importance of social context. However, very little research has distinguished empirically between older people's perception of how others in their social context perceive them (personal meta-perceptions) and the shared perceptions in society (societal meta-perceptions). Drawing on theories of intergroup relations and stereotyping and using a multilevel perspective, this article examines how well older people's perceptions of age discrimination (PAD) are predicted by (a) older people's personal meta-perceptions, (b) societal meta-perceptions, and (c) social norms of intolerance toward age prejudice. Aging meta-perceptions are differentiated into the cognitive and affective components of ageism. Multilevel analyses of data from the European Social Survey (Nover 70 years of age = 8,123, 29 countries; European Social Survey (ESS) Round 4 Data, 2008) confirmed that older people's personal meta-perceptions of negative age stereotypes and specific intergroup emotions (pity, envy, contempt) are associated with higher PAD. However, at the societal-level, only paternalistic meta-perceptions were consistently associated with greater PAD. The results show that a few meta-perceptions operate only as a psychological phenomenon in explaining PAD, some carry consonant, and others carry contrasting effects at the societal-level of analysis. This evidence extends previous research on aging meta-perceptions by showing that both the content of meta-perceptions and the level of analysis at which they are assessed make distinct contributions to PAD. Moreover, social norms of intolerance of age prejudice have a larger statistical effect than societal meta-perceptions. Social interventions would benefit from considering these differential findings. (PsycINFO Database Record
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Affiliation(s)
| | - Maria Luísa Lima
- Centro de Investigação e Intervenção Social, Instituto Universitário de Lisboa
| | - Dominic Abrams
- Centre for the Study of Group Processes, School of Psychology, University of Kent
| | - Hannah J Swift
- Centre for the Study of Group Processes, School of Psychology, University of Kent
| | - Christopher Bratt
- Centre for the Study of Group Processes, School of Psychology, University of Kent
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Abstract
The need to provide care for older people can put a strain on their adult children, potentially interfering with their work attendance. We tested the hypothesis that public care for older people (nursing homes or home care services) would moderate the association between having an older parent in need of care and reduced work attendance among the adult children. The analysis used data from a survey of Norwegian employees aged 45–65 (N = 529). Institutional care for older people in need of care (i.e. nursing homes) was associated with improved work attendance among their children—their daughters in particular. Data also indicated a moderating effect: the link between the parents’ reduced health and reduced work attendance among the children was weaker if the parent lived in a nursing home. However, the results were very different for home-based care: data indicated no positive effects on adult children’s work attendance when parents received non-institutionalised care of this kind. Overall, the results suggest that extending public care service to older people can improve their children’s ability to combine work with care for parents. However, this effect seems to require the high level of care commonly provided by nursing homes. Thus, the current trend towards de-institutionalising care in Europe (and Norway in particular) might hamper work attendance among care-giving adult children, women in particular. Home care services to older people probably need to be extended if they are intended as a real alternative to institutional care.
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Affiliation(s)
- Heidi Gautun
- Norwegian Social Research (NOVA), Oslo and Akershus University College (HiOA), Oslo, Norway
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Bratt C, Sidanius J, Sheehy-Skeffington J. Shaping the Development of Prejudice. Pers Soc Psychol Bull 2016; 42:1617-1634. [DOI: 10.1177/0146167216666267] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2016] [Accepted: 07/29/2016] [Indexed: 11/16/2022]
Abstract
Social dominance orientation (SDO) has been theorized as a stable, early-emerging trait influencing outgroup evaluations, a view supported by evidence from cross-sectional and two-wave longitudinal research. Yet, the limitations of identifying causal paths with cross-sectional and two-wave designs are increasingly being acknowledged. This article presents the first use of multi-wave data to test the over-time relationship between SDO and outgroup affect among young people. We use cross-lagged and latent growth modeling (LGM) of a three-wave data set employing Norwegian adolescents (over 2 years, N = 453) and a five-wave data set with American university students (over 4 years, N = 748). Overall, SDO exhibits high temporal rank-order stability and predicts changes in outgroup affect. This research represents the strongest test to date of SDO’s role as a stable trait that influences the development of prejudice, while highlighting LGM as a valuable tool for social and political psychology.
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Affiliation(s)
- Christopher Bratt
- University of Kent, Canterbury, UK
- Regional Center for Child and Adolescent Mental Health, Eastern and Southern Norway (RBUP), Oslo, Norway
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Bratt C. The Structure of Attitudes Toward Non-Western Immigrant Groups: Second-Order Factor Analysis of Attitudes among Norwegian Adolescents. Group Processes & Intergroup Relations 2016. [DOI: 10.1177/1368430205056470] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The study investigated the structure of outgroup attitudes among adolescents from the majority group in Norway ( N > 1100), using confirmatory factor analysis. Five non-Western immigrant groups were used as attitude objects. The analysis found that attitudes toward the five outgroups could be seen as dependent on two strongly correlated second-order factors. Two alternative models of second-order factors gained support, while the structure of outgroup attitudes appeared more stable across subsamples than anticipated. The discussion concludes that attitudes toward different ethnic outgroups will tend to be interrelated; probably dependent on both higher-order categories of outgroups as well as complex effects of intergroup contact. The paper addresses several hypotheses that may be investigated in future research.
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Bratt C, Gautun H. Bemanningsnormer i sykehjem - National norms for staffing in nursing homes. TFO 2015. [DOI: 10.18261/issn2387-5984-2015-02-06] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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Bratt C. One of few or one of many: Social identification and psychological well-being among minority youth. Br J Soc Psychol 2015; 54:671-94. [PMID: 25721036 DOI: 10.1111/bjso.12105] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2011] [Revised: 01/28/2015] [Indexed: 11/27/2022]
Abstract
Feeling belongingness with small social groups such as the family or a group of friends predicts psychological well-being. Acculturation research has argued for similar effects of belongingness with large social groups. In particular, a strong ethnic identity is assumed to improve psychological well-being among members of minority groups, but this conclusion has been drawn based on cross-sectional data. This study uses three-wave longitudinal data collected among adolescents from ethnic minority groups (N = 705), comparing identification with small groups (the family and the school class) with identification with large groups (the ethnic in-group and the nation) as predictors of psychological well-being (self-esteem, mental health problems, and life satisfaction). Analyses suggest that identification with small groups, in particular with the family, can predict developments in psychological well-being (self-esteem and mental health). In contrast, the data gave no support for causal effects from ethnic identity or national identity, in spite of substantial bivariate correlations with all three dimensions in psychological well-being. The findings have implications for acculturation research. In particular, research on ethnic or national identity as predictors of psychological well-being will benefit from adding small-group identities as covariates and using longitudinal data.
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Affiliation(s)
- Christopher Bratt
- University of Kent, UK.,The Center for Child and Adolescent Mental Health, Eastern and Southern Norway (RBUP), Oslo, Norway
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Marques S, Swift HJ, Vauclair CM, Lima ML, Bratt C, Abrams D. ‘Being old and ill’ across different countries: Social status, age identification and older people’s subjective health. Psychol Health 2014; 30:699-714. [DOI: 10.1080/08870446.2014.938742] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Vauclair CM, Marques S, Lima ML, Bratt C, Swift HJ, Abrams D. Subjective social status of older people across countries: the role of modernization and employment. J Gerontol B Psychol Sci Soc Sci 2014; 70:650-60. [PMID: 24942971 DOI: 10.1093/geronb/gbu074] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2012] [Accepted: 05/14/2014] [Indexed: 11/12/2022] Open
Abstract
OBJECTIVES To test and expand upon modernization theory's account of subjective social status (SSS) of older people in society. It was hypothesized that perceptions of older people's social status should be higher in more modernized countries and that the proportion of older people in employment should moderate the relationship between modernization and SSS of older people. METHODS Data were from the "Experiences and Expressions of Ageism" module in the fourth round of the European Social Survey. The sample analyzed included 45,706 individuals from 25 countries in the European region. Multilevel modeling was used to test the hypotheses. RESULTS The SSS of older people (aged 70 years and older) was perceived to be higher in countries with very high levels of modernization and in countries with a higher proportion of older people in employment. The positive association between modernization and SSS of older people was stronger within countries with a lower proportion of older people in employment. DISCUSSION The proportion of older people who are employed is an important factor that is related to perceptions of the social status of older people in less modern societies. The individual and societal implications are discussed, specifically in relation to policies promoting active aging.
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Affiliation(s)
| | - Sibila Marques
- Instituto Universitaário de Lisboa (ISCTE-IUL), Cis-IUL, Lisboa, Portugal
| | - Maria L Lima
- Instituto Universitaário de Lisboa (ISCTE-IUL), Cis-IUL, Lisboa, Portugal
| | - Christopher Bratt
- Centre for the Study of Group Processes, School of Psychology, University of Kent, Canterbury, UK
| | - Hannah J Swift
- Centre for the Study of Group Processes, School of Psychology, University of Kent, Canterbury, UK
| | - Dominic Abrams
- Centre for the Study of Group Processes, School of Psychology, University of Kent, Canterbury, UK
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Vauclair CM, Marques S, Lima ML, Abrams D, Swift H, Bratt C. Perceived Age Discrimination as a Mediator of the Association Between Income Inequality and Older People’s Self-Rated Health in the European Region. J Gerontol B Psychol Sci Soc Sci 2014; 70:901-12. [DOI: 10.1093/geronb/gbu066] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2013] [Accepted: 04/25/2014] [Indexed: 11/15/2022] Open
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Swift HJ, Vauclair CM, Abrams D, Bratt C, Marques S, Lima ML. Revisiting the Paradox of Well-being: The Importance of National Context. ACTA ACUST UNITED AC 2014; 69:920-9. [DOI: 10.1093/geronb/gbu011] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Abstract
Three studies examined the hypothesis that system justification is negatively associated with collective protest against ingroup disadvantage. Effects of uncertainty salience, ingroup identification, and disruptive versus nondisruptive protest were also investigated. In Study 1, college students who were exposed to an uncertainty salience manipulation and who scored higher on system justification were less likely to protest against the governmental bailout of Wall Street. In Study 2, May Day protesters in Greece who were primed with a system-justifying stereotype exhibited less group-based anger and willingness to protest. In Study 3, members of a British teachers union who were primed with a “system-rejecting” mind-set exhibited decreased system justification and increased willingness to protest. The effect of system justification on nondisruptive protest was mediated by group-based anger. Across very different contexts, measures, and methods, the results reveal that, even among political activists, system justification plays a significant role in undermining willingness to protest.
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Abstract
The influence of social norms in the context of intergroup relations has long been recognized by social psychologists, yet research on intergroup contact and social norms have usually remained disconnected. We explored the influence of direct and indirect friendship on attitudes towards ethnic minorities in Norway, and in particular the role of in-group norms about the social approval of intergroup contact as a mechanism that distinguishes direct from indirect contact. Using a sample of school students from 89 classrooms (N=823), we tested this hypothesis with both one level and multi-level structural equation modelling (ML-SEM), where the amount of contact of other classroom members was considered as a form of indirect contact. The results suggest that the intergroup contact of other in-group members (in-group friends or classmates) affects attitudes towards the out-group by changing the perception of in-group norms and by reducing intergroup anxiety. In contrast, direct contact (or contact at the individual level in the case of ML-SEM), improved attitudes only by reducing intergroup anxiety, and did not affect the perception of in-group norms.
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Bratt C, Lindberg C, Marko-Varga G. Restricted access chromatographic sample preparation of low mass proteins expressed in human fibroblast cells for proteomics analysis. J Chromatogr A 2001; 909:279-88. [PMID: 11269527 DOI: 10.1016/s0021-9673(00)01103-1] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Two-dimensional electrophoresis and modern image analysis systems have made it possible to study protein expression and regulation of proteins in biological systems. Proteins in the molecular mass region of 20-120 kDa are well investigated and described. However, proteins with masses below 20 kDa are the least investigated as they are rarely seen on 2D-PAGE due to fast migrations in the electric field and lack of staining efficiency. This paper describes a technique that enriches proteins in the lower mass region using solid-phase extraction. The purification step is carried out using C18 functionalised "restricted access" affinity chromatography whereby simultaneous trace enrichment and sample clean up is achieved. In this study expression patterns of TGF-beta stimulated and non-stimulated fibroblasts were compared after the solid-phase fractionation procedure. An increased expression pattern was obtained whereby 400 protein spots could be detected by image analysis in the <20-kDa region. Out of these, specific regulations of 14 spots were found by quantitative image analysis and spots of interest were identified with MALDI TOF-MS. The regulated and identified proteins were triosephosphate isomerase, cofilin and heat shock 27-kDa protein.
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Affiliation(s)
- C Bratt
- AstraZeneca, R & D Lund, Sweden
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21
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Gooderham NJ, Murray S, Lynch AM, Edwards RJ, Yadollahi-Farsani M, Bratt C, Rich KJ, Zhao K, Murray BP, Bhadresa S, Crosbie SJ, Boobis AR, Davies DS. Heterocyclic amines: evaluation of their role in diet associated human cancer. Br J Clin Pharmacol 1996; 42:91-8. [PMID: 8807149 PMCID: PMC2042638 DOI: 10.1046/j.1365-2125.1996.37513.x] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
1. Heterocyclic amines are formed in parts per billion levels when meat is cooked. 2. The heterocyclic amines MeIQx and PhIP are efficiently absorbed into the systemic circulation after ingestion of cooked food. 3. We have shown that MeIQx and PhIP, both in vitro and in vivo, are substrates for human hepatic CYP1A2, which exclusively and efficiently catalyses their conversion to genotoxic hydroxylamines. 4. MeIQx and PhIP are promutagens. MeIQx is a very powerful bacterial mutagen whereas PhIP is a more potent mammalian cell mutagen. Using a mammalian cell target gene, hprt, we have shown that PhIP induces a characteristic mutational 'fingerprint'. 5. MeIQx and PhIP are carcinogenic in bioassays. The PhIP mutational 'fingerprint' has been detected in the Apc gene of 5/8 colonic tumours induced by PhIP in rats.
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Affiliation(s)
- N J Gooderham
- Department of Clinical Pharmacology, Royal Postgraduate Medical School, London, UK
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Andersson L, Bratt C, Arnoldsson KC, Herslöf B, Olsson NU, Sternby B, Nilsson A. Hydrolysis of galactolipids by human pancreatic lipolytic enzymes and duodenal contents. J Lipid Res 1995. [DOI: 10.1016/s0022-2275(20)41146-0] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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Andersson L, Bratt C, Arnoldsson KC, Herslöf B, Olsson NU, Sternby B, Nilsson A. Hydrolysis of galactolipids by human pancreatic lipolytic enzymes and duodenal contents. J Lipid Res 1995; 36:1392-400. [PMID: 7666015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
Monogalactosyldiacylglycerols (MGDG), digalactosyldiacylglycerols (DGDG) and sulfoquinovosyldiacylglycerols (SQDG) are major lipids in vegetable food. Their digestion and absorption are unknown. This study examines the hydrolysis of galactolipids in vitro with human duodenal contents, pancreatic juice, and purified human pancreatic lipases. Galactolipids were incubated with human duodenal contents, pancreatic juice, pure pancreatic carboxyl ester lipase (CEL), and colipase-dependent lipase with colipase (Lip-Col). Hydrolysis was estimated as release of free fatty acids and by the use of [3H]galactose or [3H]fatty acid-labeled DGDG. Pancreatic juice and duodenal contents hydrolyzed DGDG to fatty acids, digalactosylmonoacylglycerol (DGMG) and water-soluble galactose-containing compounds. The hydrolysis of DGDG was bile salt-dependent and had a pH optimum at 6.5-7.5. Human pancreatic juice released fatty acids from MGDG, DGDG, and SQDG. Purified CEL hydrolyzed all three substrates; the hydrolysis rate was MGDG > SQDG > DGDG. Pure Lip-Col had activity toward MGDG but had little activity against DGDG. Separation of pancreatic juice by Sephadex G100 gel filtration chromatography revealed two peaks with galactolipase activity that coincided with CEL (molecular mass 100 kD) and lipase (molecular mass 50 kD) peaks. In contrast to pure Lip-Col enzymes of the latter peak were as active against DGDG as against MGDG. Thus, DGDG is hydrolyzed both by CEL and by a pancreatic enzyme(s) with a molecular mass of 40-50 kD to fatty acids and lyso DGDG. MGDG, DGDG, and SQDG are all hydrolyzed by human pancreatic juice. Pure CEL hydrolyzed all three substrates.
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Affiliation(s)
- L Andersson
- Department of Internal Medicine, University of Lund, Sweden
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