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New Theoretical Model (new + theoretical_model)
Selected AbstractsTransdisciplinary concepts and measures of craving: commentary and future directionsADDICTION, Issue 8s2 2000David B. Abrams A new theoretical model of craving is needed that uses a common language and standardized measures. The new conceptual model must fully integrate discoveries from cellular biology, neuroscience, animal and human laboratory, cognitive-behavioral social learning and socio-cultural disciplines. A transdisciplinary synthesis can then guide methods and measurement development. Mapping the structural pathways and interactions among mediators and moderators of craving will improve the diagnostic and prognostic tools in order to inform new treatments and prevention strategies. [source] Crystal structure of defect-containing semiconductor nanocrystals , an X-ray diffraction studyJOURNAL OF APPLIED CRYSTALLOGRAPHY, Issue 4 2009Maja Buljan Defects of crystal structure in semiconductor nanocrystals embedded in an amorphous matrix are studied by X-ray diffraction and a full-profile analysis of the diffraction curves based on the Debye formula. A new theoretical model is proposed, describing the diffraction from randomly distributed intrinsic and extrinsic stacking faults and twin blocks in the nanocrystals. The application of the model to full-profile analysis of experimental diffraction curves enables the determination of the concentrations of individual defect types in the nanocrystals. The method has been applied for the investigation of self-organized Ge nanocrystals in an SiO2 matrix, and the dependence of the structure quality of the nanocrystals on their deposition and annealing parameters was obtained. [source] Some highlights of research on aging with invertebrates, 2009AGING CELL, Issue 5 2009Linda Partridge Summary This annual review focuses on invertebrate model organisms, which shed light on new mechanisms in aging and provide excellent systems for both genome-wide and in-depth analysis. This year, protein interaction networks have been used in a new bioinformatic approach to identify novel genes that extend replicative lifespan in yeast. In an extended approach, using a new, human protein interaction network, information from the invertebrates was used to identify new, candidate genes for lifespan extension and their orthologues were validated in the nematode Caenorhabditis elegans. Chemosensation of diffusible substances from bacteria has been shown to limit lifespan in C. elegans, while a systematic study of the different methods used to implement dietary restriction in the worm has shown that they involve mechanisms that are partially distinct and partially overlapping, providing important clarification for addressing whether or not they are conserved in other organisms. A new theoretical model for the evolution of rejuvenating cell division has shown that asymmetrical division for either cell size or for damaged cell constituents results in increased fitness for most realistic levels of cellular protein damage. Work on aging-related disease has both refined our understanding of the mechanisms underlying one route to the development of Parkinson's disease and has revealed that in worms, as in mice, dietary restriction is protective against cellular proteotoxicity. Two systematic studies genetically manipulating the superoxide dismutases of C. elegans support the idea that damage from superoxide plays little or no role in aging in this organism, and have prompted discussion of other kinds of damage and other kinds of mechanisms for producing aging-related decline in function. [source] Parental Identity and Reflected-Appraisals: Measurement and Gender DynamicsJOURNAL OF MARRIAGE AND FAMILY, Issue 2 2001Trent W. Maurer A new theoretical model for parental identity, reflected-appraisals, and behavior was proposed. Parental identity and behavior in married parents were then investigated as a function of partner's and perceived reflected-appraisals, taking into account gender context effects. Sixty-four married couples completed the Caregiving and Breadwinning Identity and Reflected-Appraisal Inventory (CBIRAI), developed for this study to assess parental caregiving and breadwinning identity and reflected-appraisals, as well as caregiving and breadwinning behavior measures. The model was confirmed for fathers and partially confirmed for mothers. Specifically, caregiving identity and behavior in fathers, and breadwinning identity in mothers were functions of perceived reflected-appraisals. Limitations and implications are discussed. [source] Exploring the Subconcepts of the Wittmann-Price Theory of Emancipated Decision-Making in Women's Health CareJOURNAL OF NURSING SCHOLARSHIP, Issue 4 2006Ruth A. Wittmann-Price Purpose: To explore the subconcepts of the Wittmann-Price Theory of Emancipated Decision-Making (EDM); which is proposed as a new theoretical model for the nursing care of women to increase women's satisfaction with decision-making about healthcare issues. Infant feeding method was used as the clinical exemplar. Design and Method: A descriptive correlational design was used to test the five identified subconcepts of EDM (empowerment, flexible environment, personal knowledge, reflection, and social norms) in women's healthcare. The relationship of emancipated decision-making and satisfaction were explored with the Subject Demographic Questionnaire (SDQ), the Wittmann-Price Theory of Emancipated Decision-making Scale (EDMS), and the Satisfaction with Decision (SWD) scale. The research design was retrospective, without random sampling of subjects. Four research questions were posed for this investigation. Women who had uncomplicated deliveries and met the selected criteria were enrolled (N=97). Findings: All five subconcepts of EDM were scored on subscales on the EDMS; flexible environment and personal knowledge had the highest mean scores. Pearson correlations showed that all five subscales were significantly related to each other except reflection with personal knowledge and reflection with social norms. A significant relationship was found between the EDM and satisfaction with the decision. Personal knowledge and flexible environment were the best predictors of satisfaction with the decision. Conclusions: The Wittmann-Price Theory of EDM is a theoretical model with implications for nursing care of women who are involved in a healthcare decision, such as choice of infant feeding. Further studies are needed to determine the importance of each of the subconcepts in relation to emancipated decision-making. [source] The new object-spatial-verbal cognitive style model: Theory and measurementAPPLIED COGNITIVE PSYCHOLOGY, Issue 5 2009Olesya Blazhenkova The current study challenges traditional approaches to Visual-Verbal cognitive style as a unitary bipolar dimension, and instead suggests a new three-dimensional cognitive style model developed on the basis of modern cognitive science theories that distinguish between object imagery, spatial imagery and verbal dimensions. The results of the confirmatory factor analysis demonstrated that the overall fit to the data of the new three-dimensional model of cognitive style was significantly better than that of a traditional model. Furthermore, based on the new theoretical model, we designed and validated a new self-report instrument assessing the individual differences in object imagery, spatial imagery and verbal cognitive styles, the Object-Spatial Imagery and Verbal Questionnaire (OSIVQ). Across a series of studies, the OSIVQ demonstrated acceptable internal reliability as well as construct, criterion and ecological validity. The current study supports the validity of an object-spatial-verbal cognitive style dimension and related measures when developed on the basis of modern cognitive science theories. Copyright © 2008 John Wiley & Sons, Ltd. [source] | ||||||||||