Home About us Contact
|
Home About us Contact | ||
|
|
||
Related Characteristics (relate + characteristic)
Selected AbstractsThe community-wide and guild-specific effects of pubescence on the folivorous insects of manzanitas Arctostaphylos spp.ECOLOGICAL ENTOMOLOGY, Issue 4 2003Melissa R. Andres Abstract., 1.,Insect communities on 26 species of manzanita Arctostaphylos spp. (Ericaceae) were sampled in order to examine the effects of variation in foliar pubescence traits on a community of folivorous insects. Manzanitas vary widely in pubescence density, length, and glandularity both within and between species. 2.,Linear models were fitted and evaluated to determine whether pubescence traits are associated with the species richness and abundance of folivorous insects after accounting for the effects of other relevant habitat and host-plant related characteristics. 3.,Pubescence traits were clearly associated with both community-wide and guild-specific variation in the structure of the folivorous insect community of manzanitas, however the effects of pubescence were manifested primarily as effects on the abundance of folivores not on species richness. The species richness of folivorous insects on manzanitas was not associated with pubescence density or length but was associated positively with glandularity. 4.,The abundance of all guilds except leaf-mining insects was lower on manzanitas having longer pubescence. In contrast, the abundance of external-chewing insects was higher on plants having denser pubescence and on plants having glandular pubescence. 5.,Overall, the results suggest that both longer pubescence and the amount of contact between an insect and pubescence act quantitatively to decrease the abundance of external-feeding guilds of folivorous insects. The abundance of species in internal-feeding guilds that oviposit directly on leaves is unrelated to foliar pubescence traits in the host plant. [source] Influence of cosolvents and in situ forming hydroxyapatite on the mechanical characteristics of collagen filmsJOURNAL OF BIOMEDICAL MATERIALS RESEARCH, Issue 1 2002Hsiu-O Ho Abstract Collagen was processed into films in mixtures containing various ratios of water, propylene glycol, and ethanol. An experimental mixture design was applied to characterize the effects of individual solvents and their interactions on the mechanical properties of collagen films. Scanning electron microscopy (SEM) was used to examine the surface properties of collagen films. The ultimate tensile strength (UTS) and related characteristics of collagen films were also evaluated with dynamic mechanical analysis. The effect of in situ forming hydroxyapatite (HAP) within collagen films at a concentration of 10 mM on the physical characteristics of these films was evaluated by the same methods. With X-ray and SEM examinations, it was confirmed that HAP was formed inside the collagen film. However, the UTS of collagen films without HAP was 4,5 times higher than that with HAP. This was probably due to the discontinuity of the film structure caused by HAP in the collagen films. The results of a statistical analysis of the experimental design revealed the influence of the solvent mixtures on the mechanical properties of the collagen films with and without HAP, showing similar responses for the UTS and modulus of elasticity. Both parameters showed a maximal response in the solvent range containing a lower percentage of ethanol with the desired percentage of propylene glycol to plasticize the collagen films. © 2002 Wiley Periodicals, Inc. J Biomed Mater Res 62: 22,29, 2002 [source] The Relationships of the Level of Response to Alcohol and Additional Characteristics to Alcohol Use Disorders Across Adulthood: A Discrete-Time Survival AnalysisALCOHOLISM, Issue 9 2009Ryan S. Trim Background:, A low level of response (LR) to alcohol has been shown to relate to a higher risk for alcohol use disorders (AUDs). However, no previous research has examined the association between LR and the development of AUDs in the context of additional robust risk factors for AUDs. This study evaluated whether LR and other related characteristics predicted the occurrence of AUDs across adulthood using discrete-time survival analysis (DTSA). Methods:, A total of 297 probands from the San Diego Prospective Study reported on the LR to alcohol, a family history (FH) of AUDs, the typical drinking quantity, the age of drinking onset, the body mass index and the age at the baseline (T1) assessment. Alcohol use disorders (AUDs) were evaluated at the 10-year (T10), T15, T20, and T25 follow-ups. Results:, A low LR to alcohol predicted AUD occurrence over the course of adulthood even after controlling for the effects of other robust risk factors. Interaction effects revealed that the impact of FH on AUDs was only observed for subjects with high T1 drinking levels, and probands with high T1 drinking were at high risk for AUDs regardless of their age of onset. Conclusions:, The findings illustrate that LR is a unique risk factor for AUDs across adulthood, and not simply a reflection of a broader range of risk factors. The continued investigation of how LR is related to AUD onset later in life will help inform treatment providers about this high-risk population, and future longitudinal evaluations will utilize DTSA to assess rates of AUD remission as well as the onset of drinking outcomes in adolescent samples. [source] A reflective learning framework to evaluate CME effects on practice reflectionTHE JOURNAL OF CONTINUING EDUCATION IN THE HEALTH PROFESSIONS, Issue 2 2010Kit H. Leung PhD Researcher Abstract Introduction: The importance of reflective practice is recognized by the adoption of a reflective learning model in continuing medical education (CME), but little is known about how to evaluate reflective learning in CME. Reflective learning seldom is defined in terms of specific cognitive processes or observable performances. Competency-based evaluation rarely is used for evaluating CME effects. To bridge this gap, reflective learning was defined operationally in a reflective learning framework (RLF). The operationalization supports observations, documentation, and evaluation of reflective learning performances in CME, and in clinical practice. In this study, the RLF was refined and validated as physician performance was evaluated in a CME e-learning activity. Methods: Qualitative multiple-case study wherein 473 practicing family physicians commented on research-based synopses after reading and rating them as an on-line CME learning activity. These comments formed 2029 cases from which cognitive tasks were extracted as defined by the RLF with the use of a thematic analysis. Frequencies of cognitive tasks were compared in a cross-case analysis. Results: Four RLF cognitive processes and 12 tasks were supported. Reflective learning was defined as 4 interrelated cognitive processes: Interpretation, Validation, Generalization, and Change, which were specified by 3 observable cognitive tasks, respectively. These 12 tasks and related characteristics were described in an RLF codebook for future use. Discussion: Reflective learning performances of family physicians were evaluated. The RLF and its codebook can be used for integrating reflective learning into CME curricula and for developing competency-based assessment. Future research on potential uses of the RLF should involve participation of CME stakeholders. [source] | ||||||||||