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PubMed1998

X-PEEM Study on Surface Orientation of Stylized and Rubbed Polyimides.

X-ray photoelectron emission microscopy (X-PEEM) was used to study the surface orientation of stylized and rubbed polyimide thin films. Using soft X-rays produced by a synchrotron light source, this technique combines high spatial resolution imaging with near-edge X-ray absorption fine structure (NEXAFS) spectroscopy to yield information on the surface orientation of the films. Stylizing is an ideal model of the rubbing process since the local stress acting on the polyimide to orient the molecules can be calculated. The minimum normal stress necessary to orient the surface of BPDA-PDA films was found to be 45 MPa much lower than the bulk yield stress of 200-300 MPa. Studies of the polyimide films oriented by the conventional rubbing method showed lateral inhomogeneities in the orientation of the polymer at the surface.

Journal Article↗
PubMed2002

Structure-independent cross-validation between residual dipolar couplings originating from internal and external orienting media.

Lanthanide-substituted calcium binding proteins are known to partially orient in high magnetic fields. Orientation provides residual dipolar couplings (rdc's). Two of these systems, Tm3+- and Dy3+-substituted calbindin D9k, dissolved in an external orienting medium (nonionic liquid crystalline phase) provide rdc values which are the sum of those induced by the lanthanides and by the liquid crystalline phase on the native calcium binding protein. This structure-independent check shows the innocence of the orienting medium with respect to the structure of the protein in solution. Furthermore, the simultaneous use of lanthanide substitution and external orienting media provides a further effective tool to control and tune the orientation tensor.

Calbindins↗
PubMed1998

Changes in the sexual orientation of six heterosexual male-to-female transsexuals.

Researchers traditionally have assumed that sex reassignment procedures do not change sexual orientation. Of 20 transsexuals of various types that were interviewed, 6 heterosexual male-to-female transsexual respondents reported that their sexual orientation had changed since transitioning from male to female. These respondents stated that before transitioning they had been sexually orientated towards females. After transitioning, these same respondents reported that they were sexually orientated towards males. Five of the six respondents reported having various sexual encounters with males since transitioning. The respondents explained the changes in their sexual orientation as part of their emerging female gender identities. Three of the respondents claimed that the use of female hormones played a role in changing their sexual orientation. It did not appear that the respondents' post-transitional sexual attractions towards males were similar to autogynephilic images and fantasies described by Blanchard (1991).

Female↗
PubMed1997

Defining and measuring sexual orientation: a review.

How to define and identify sexual orientations for the purpose of constructing representative samples of homosexuals, bisexuals, and heterosexuals is unclear and confusing to researchers. Different definitions and measures have been proposed and used to develop samples since the 1860s when sexual orientations first gained widespread research interest. Unfortunately, the definitions and measurement tools used since then result in the selection of divergent and incomparable samples. If advances in the understanding of sexual orientations are to be made, it is critical that definitions and measures of sexual orientation be standardized. This paper reviews and critiques definitions and measures of sexual orientation that have been proposed and used by researchers over the past century. This review is intended to further our understanding of this subject and to encourage researchers to be critical of how they classify subjects based upon sexual orientation.

Female↗
PubMed1983

Sex role orientation and self-esteem: a critical meta-analytic review.

Research on the relation between sex role orientation and psychological well-being has been guided by one of three models. The traditional congruence model holds that psychological well-being is fostered only when one's sex role orientation is congruent with one's gender; the androgyny model proposes that well-being is maximized when one's sex role orientation incorporates a high degree of both masculinity and femininity regardless of one's gender; the masculinity model posits that well-being is a function of the extent to which one has a masculine sex role orientation. The adequacy of these three models was tested by means of a meta-analysis of 35 studies of the relation between sex role orientation and self-esteem, the indicator of psychological well-being most widely used in sex role studies. The results of the meta-analysis were most supportive of the masculinity model and showed that the strength of observed relations between sex role orientation and self-esteem varied as a function of both the sex role measure and the type of self-esteem measure used in the studies. In addition, a number of methodological issues was identified that should be taken into consideration in future research.

Female↗
PubMed1990

Relationship orientation, quality of prior relationship, and distress among caregivers of Alzheimer's patients.

Communal orientation and closeness of the caregiver-patient relationship were investigated as predictors of distress among caregivers of Alzheimer's patients. Persons high in communal orientation were less depressed than those low in communal orientation. Caregivers reporting a close relationship with the patient before illness onset felt less burdened than those whose relationship had not been close. Communal orientation interacted with closeness when data were analyzed separately for men and women. Among men, being low in communal orientation and having a relatively poor prior relationship were associated with the highest levels of depression, levels that put them at risk for clinical depression. Among women low in communal orientation, higher levels of depression were related to having a close prior relationship with the patient.

Adult↗
PubMed2005

Goal orientation: effects on backing up behavior, performance, efficacy, and commitment in teams.

The author examined the predictive validity of goal orientation in teams on both team process and outcome variables. Results indicate that when mean goal orientation scores were used as a way of describing team members' inputs, learning orientation was related to backing up behavior, efficacy, and commitment. The relationships between performance orientation and efficacy and commitment, however, were more complex and were clarified when task performance was also taken into account. Performance orientation had a negative effect on efficacy when task performance was low and a positive effect on commitment when task performance was high. The implications of these findings for theory and research on goal orientation in teams and team staffing are discussed.

Adult↗
PubMed2005

A motivated action theory account of goal orientation.

Rapid organizational change is increasing the pressure on employees to continually update their skills and adapt their behavior to new organizational realities. Goal orientation is a promising motivational construct that may explain why some individuals adapt to change better. Unfortunately, the current goal orientation literature is in a state of conceptual and methodological disarray. This presentation reviews the goal orientation literature and identifies numerous conceptual ambiguities, including definitional inconsistencies, dimensional inconsistencies, and inconsistencies in the conceptualization of stability. These conceptual ambiguities result in a confusing array of goal orientation measures and manipulations and ultimately an incoherent empirical database. A dynamic self-regulation model of goal orientation, termed motivated action theory, is presented to integrate the various conceptual perspectives and to provide guidelines for future goal orientation research.

Adaptation, Psychological↗
PubMed2006

Longitudinal examination of the role of goal orientation in cross-cultural adjustment.

In this longitudinal study, the authors introduced goal orientation theory to the study of cross-cultural adjustment. The authors examined relationships among dispositional goal orientation, domain-specific self-efficacy, and cross-cultural adjustment. Results indicated that a learning orientation was positively related to sojourners' academic and social self-efficacy, whereas a performance orientation was negatively related to sojourners' social self-efficacy. Sojourners' academic and social self-efficacy were positively related to academic and social adjustment, respectively. A learning orientation was positively related to academic and social adjustment, and the relationship was mediated by self-efficacy. A performance orientation was not related to adjustment. Finally, academic adjustment was positively related to grade point average. The authors discussed implications for research and practices.

Adaptation, Psychological↗
PubMed2002

Sexual orientations in perspective.

This article presents a new paradigm for understanding the complexity of human sexual, affectional, and erotic attractions--commonly known as sexual orientation. This new paradigm recognizes that there is great diversity among sexual orientations, erotic and emotional attractions, behaviors, and identities and that there are complex interrelations among these dimensions. Sexual orientation is determined by multiple influences, including a wide range of sociocultural factors. The development of sexual orientation is arrived at through multiple pathways. Individuals with the same sexual orientation may have little else in common. Thus, a model of sexual orientation is presented that is based on multiplicity, not sameness, and that examines the overlapping identities and statuses of culture, gender, age, race, ethnicity, class, disability, and sexuality.

Female↗
PubMed1980

Orientation bias of cat retinal ganglion cells.

Kuffler described the receptive fields of cat retinal ganglion cells as having a concentric arrangement. This has usually been taken to mean that they are approximately circular in form (see, for example, ref. 2). Hammond tested the circularity of the centre component of receptive fields by plotting a contour of isosensitivity to a small flashed spot. He concluded that centres were often ellipitical (average ratio of major to minor axis 1.23) and that more than 50% of the recorded cells had the major axis oriented within /+- 20 degrees of the horizontal. Such data are important for discussions of the neurophysiological basis of the 'oblique effect' (reduced visibility for periodic grating patterns when oriented away from the vertical or horizontal) observed in psychophysical experiments on humans because subcortical units are often assumed to be orientationally unbiased. Orientation selectivity is a prominent attribute of visual cortical neurones so analysis has usually emphasized the distribution of orientation selectivity at that level. The results presented here redirect attention to the retinal level since they reveal a previously unsuspected systematic relation between orientation bias of ganglion cells and their location relative to the area centralis.

Action Potentials↗
PubMed1999

Involvement of visual cortex in tactile discrimination of orientation.

The primary sense modalities (vision, touch and so on) are generally thought of as distinct. However, visual imagery is implicated in the normal tactile perception of some object properties, such as orientation, shape and size. Furthermore, certain tactile tasks, such as discrimination of grating orientation and object recognition, are associated with activity in areas of visual cortex. Here we show that disrupting function of the occipital cortex using focal transcranial magnetic stimulation (TMS) interferes with the tactile discrimination of grating orientation. The specificity of this effect is illustrated by its time course and spatial restriction over the scalp, and by the failure of occipital TMS to affect either detection of an electrical stimulus applied to the fingerpad or tactile discrimination of grating texture. In contrast, TMS over the somatosensory cortex blocked discrimination of grating texture as well as orientation. We also report that, during tactile discrimination of grating orientation, an evoked potential is recorded over posterior scalp regions with a latency corresponding to the peak of the TMS interference effect (about 180 ms). The findings indicate that visual cortex is closely involved in tactile discrimination of orientation. To our knowledge, this is the first demonstration that visual cortical processing is necessary for normal tactile perception.

Evoked Potentials↗
PubMed2004

Natural examples of olivine lattice preferred orientation patterns with a flow-normal a-axis maximum.

Tectonic plate motion is thought to cause solid-state plastic flow within the underlying upper mantle and accordingly lead to the development of a lattice preferred orientation of the constituent olivine crystals. The mechanical anisotropy that results from such preferred orientation typically produces a direction of maximum seismic wave velocity parallel to the plate motion direction. This has been explained by the existence of an olivine preferred orientation with an 'a-axis' maximum parallel to the induced mantle flow direction. In subduction zones, however, the olivine a axes have been inferred to be arranged roughly perpendicular to plate motion, which has usually been ascribed to localized complex mantle flow patterns. Recent experimental work suggests an alternative explanation: under conditions of high water activity, a 'B-type' olivine preferred orientation may form, with the a-axis maximum perpendicular to the flow direction. Natural examples of such B-type preferred orientation are, however, almost entirely unknown. Here we document widespread B-type olivine preferred orientation patterns from a subduction-type metamorphic belt in southwest Japan and show that these patterns developed in the presence of water. Our discovery implies that mantle flow above subduction zones may be much simpler than has generally been thought.

Journal Article↗
PubMed2001

Dynamics of the orientation-tuned membrane potential response in cat primary visual cortex.

Neurons in the primary visual cortex are highly selective for stimulus orientation, whereas their thalamic inputs are not. Much controversy has been focused on the mechanism by which cortical orientation selectivity arises. Although an increasing amount of evidence supports a linear model in which orientation selectivity is conferred upon visual cortical cells by the alignment of the receptive fields of their thalamic inputs, the controversy has recently been rekindled with the suggestion that late cortical input--delayed by multiple synapses--could lead to sharpening of orientation selectivity over time. Here we used intracellular recordings in vivo to examine temporal properties of the orientation-selective response to flashed gratings. Bayesian parameter estimation demonstrated that both preferred orientation and tuning width were stable throughout the response to a single stimulus.

Animals↗
PubMed1995

Serum selenium, zinc and copper in Swedish and Finnish orienteers. A comparative study.

Serum selenium, zinc and copper concentrations of 127 highly-trained Swedish orienteers have been analysed and compared with the corresponding values of 30 elite Finnish orienteers, and those of 111 healthy Finnish medical students. The mean serum selenium levels of Finnish orienteers, 1.35 mumol l-1, and students, 1.38 mumol l-1, were statistically significantly higher than those of Swedish orienteers, 1.09 mumol l-1. The serum levels of selenium were lower than 1.0 mumol l-1 in 27% of Swedish orienteers. This is obviously due to the lower selenium intake of the population in Sweden, where the soil selenium content is known to be low. Serum levels of zinc were within the reference interval in both Swedish and Finnish orienteers (mean values 14.8 and 14.1 mumol l-1, respectively). However, Finnish students had significantly lower serum levels of zinc, 12.5 mumol l-1. The mean serum concentration of copper was statistically significantly higher in females than in males.

Adolescent↗
PubMed2000

Orientation specificity of the Lactococcus lactis Chi site.

BACKGROUND: In Escherichia coli, the Chi sequence modulates the activity of RecBCD, a powerful double-stranded (ds) DNA exonuclease/helicase. Chi attenuates RecBCD exonuclease activity and stimulates homologous recombination in an orientation-dependent manner. ChiEc is frequent and over-represented on its genome, which is thought to be related to its role in dsDNA break repair. We previously identified a Chi-like sequence (referred to as ChiLl) and an exonuclease/helicase in the Gram-positive bacterium Lactococcus lactis. ChiLl and RexAB are functional analogues of ChiEc and RecBCD. RESULTS: We report that ChiLl attenuates RexAB exonuclease activity and stimulates homologous recombination in an orientation-dependent manner. Analysis of ChiLl distribution on the L. lactis chromosome reveals that ChiLl is frequent, highly over-represented, and oriented with respect to the direction of replication. CONCLUSION: Our results show that a single orientation of ChiLl interacts with RexAB. The active orientation is preferentially found on the replication leading strand of the L. lactis genome, consistent with a primary role of ChiLl in repair of dsDNA breaks at the replication fork. We propose that orientation-dependence of Chi activity and over-representation of Chi sequences on bacterial genomes may be conserved properties of exonuclease/helicase-Chi couples. Other properties of the Chi sequence distribution on the genomes might reflect more specific characteristics of each couple and of the host.

Chromosome Inversion↗
PubMed2001

Measuring the socialization of graduate and diplomate nurses using the Corwin Role Orientation Scale.

The nature of United Kingdom (UK) nursing education has changed significantly as the responsibility has been transferred from hospitals to the University sector. More information is needed on the outcome of the Project 2000 diploma and degree courses given the rapidly changing health care context. This paper focuses on the role socialization of graduate and diploma nurses. As part of a larger study, this research investigated the role orientations of 52 nursing graduates and 28 diplomates from two different universities at three time points; on graduation and at 6 and 12 months postgraduation. The Corwin Role Orientation Scale was selected and modified for the study. It comprised of three separate scales measuring professional, bureaucratic and service orientation. The data from the two groups of nurses were examined to identify nurses' ideal role orientations and role discrepancies over the transitionary period from graduate to qualified nurse. Although the results showed observed differences between the groups over time, none of these differences were statistically significant. The findings raise a number of questions about the value of the instrument as a measure in the contemporary nursing context. Furthermore, each of the Corwin subscales had a low internal reliability. A possible explanation may be that the instrument, which was developed in the United States of America (USA) in the 1960s, and modified, for this study, has little relevance for contemporary UK nursing. The study findings are also limited by the small size of the sample. In spite of these limitations, the study suggests there are few differences between the role orientations and socialization experiences of UK nursing graduates and diplomates. Indeed, both programmes commonly take place in university settings and students receive the same amount of clinical experience. Further instrument development and exploratory research is recommended to identify the role socialization and orientations of UK nurses through larger national studies.

Education, Nursing, Baccalaureate↗
PubMed2003

Spirituality and sexual orientation: relationship to mental well-being and functional health status.

BACKGROUND: Research has shown that spirituality has a positive effect on physical and mental health; however, few studies have explored the influence of spirituality and sexuality on mental well-being and functional health status in people with human immunodeficiency virus (HIV)/acquired immunodeficiency syndrome (AIDS). AIM: This descriptive cross-sectional study was designed to examine the relationships among spirituality, sexual orientation, mental well-being and aspects of functional health status (physical, role, social and cognitive functioning) in a sample of 117 African-American men and women living with HIV/AIDS. METHODS: Spirituality was measured using the Spiritual Well-Being Scale. A demographic questionnaire gathered data on sexual orientation, age and gender. The Medical Outcomes Study Questionnaire-30 assessed aspects of functional health status and mental well-being. The HIV Symptom Checklist for Persons With HIV disease was used to collect data on HIV symptoms. The data were collected in 1996. FINDINGS: The findings indicate that spirituality had a direct relationship with cognitive and social functioning and was inversely related to HIV symptoms. Sexual orientation had direct relationships with mental well-being, cognitive, physical, social and role functioning. t-Tests showed that heterosexual participants reported poorer mental well-being and functional health status compared with homosexual participants. Regression analysis showed that spirituality, sexual orientation, age and HIV symptoms contributed significantly to mental well-being and functional health status. CONCLUSIONS: The regression analysis showed that spirituality, sexual orientation, age and HIV symptoms contributed significantly to mental well-being and functional health status. Further research is needed to explore the various ways that sexual orientation influences health status findings in those with HIV disease in certain segments of the population. The findings support the inclusion of spirituality as a variable when examining mental well-being and physical health. Finally, given the limitations of the design, more rigorous methods should be employed to understand further the contribution of spirituality to the health status of African-Americans living with HIV, because of its social importance to this particular community.

Adult↗