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Search Results: 1 - 10 of 408344 matches for " Anne M Rentz "
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Psychometric characteristics of the short form 36 health survey and functional assessment of chronic illness Therapy-Fatigue subscale for patients with ankylosing spondylitis
Dennis A Revicki, Anne M Rentz, Michelle P Luo, Robert L Wong
Health and Quality of Life Outcomes , 2011, DOI: 10.1186/1477-7525-9-36
Abstract: We analyzed clinical and patient-reported outcome (PRO) data collected during 12-week, double-blind, placebo-controlled periods of two randomized controlled trials comparing adalimumab and placebo for the treatment of active AS. The Bath Ankylosing Spondylitis Disease Activity Index, Bath Ankylosing Spondylitis Functional Index, and other clinical measures were collected during the clinical trial. We evaluated internal consistency/reliability, construct validity, and responsiveness to change for the SF-36 and FACIT-Fatigue.The SF-36 (Cronbach alpha, 0.74-0.92) and FACIT-Fatigue (Cronbach alpha, 0.82-0.86) both had good internal consistency/reliability. At baseline, SF-36 and FACIT-Fatigue scores correlated significantly with Ankylosing Spondylitis Quality of Life scores (r = -0.36 to -0.66 and r = -0.70, respectively; all p < 0.0001). SF-36 scores varied by indicators of clinical severity, with greater impairment observed for more severe degrees of clinical activity (all p < 0.0001). FACIT-Fatigue scores correlated significantly with SF-36 scores (r = 0.42 to 0.74; all p < 0.0001) and varied by clinical severity (p < 0.05 to p < 0.0001).The SF-36 is a reliable, valid, and responsive measure of health-related quality of life and the FACIT-Fatigue is a brief and psychometrically sound measure of the effects of fatigue on patients with AS. These PROs may be useful in evaluating effectiveness of new treatments for AS.ClinicalTrials.gov: NCT00085644 and NCT00195819Ankylosing spondylitis (AS) is a chronic and progressive inflammatory disorder that primarily affects the axial skeleton, sacroiliac joints of the pelvis, and thoracic cage [1,2]. Patients experience pain, joint stiffness, and the eventual loss of spinal mobility with disease progression. Patients with AS frequently experience impaired physical function and well-being, require time away from work because of disability, and suffer from diminished health-related quality of life (HRQOL) [3-7]. The impact of AS on
Retraction: Psychometric characteristics of the ankylosing spondylitis quality of life questionnaire, short form 36 health survey, and functional assessment of chronic illness therapy-fatigue subscale
Dennis A Revicki, Anne M Rentz, Michelle P Luo, Robert L Wong, Lynda C Doward, Stephen P McKenna
Health and Quality of Life Outcomes , 2009, DOI: 10.1186/1477-7525-7-34
Abstract: Not all authors approved of the final content or publication of this article [1]. Subsequently, all authors have agreed that the article should be retracted. This article is being retracted as assumptions were made about the nature of the outcome data that should have been tested before the analyses were conducted. In addition, there is disagreement among the authors about the statistical analyses that were used and it is possible that incorrect conclusions may have been drawn that are not supported by the data presented. The authors wish to apologise for any inconvenience this may have caused the editorial, publishing staff and readers.
Psychometric characteristics of the ankylosing spondylitis quality of life questionnaire, short form 36 health survey, and functional assessment of chronic illness therapy-fatigue subscale
Dennis A Revicki, Anne M Rentz, Michelle P Luo, Robert L Wong, Lynda C Doward, Stephen P McKenna
Health and Quality of Life Outcomes , 2009, DOI: 10.1186/1477-7525-7-6
Abstract:
Solar and magnetospheric forcing of the low latitude thermospheric mass density as observed by CHAMP
S. Müller, H. Lühr,S. Rentz
Annales Geophysicae (ANGEO) , 2009,
Abstract: We have studied the dependence of the thermospheric mass density at equatorial latitudes on the influence of various drivers. This statistical study is based on CHAMP accelerometer measurements. Our aim is to delineate the influences of the different contributions. For the isolation of the effects we make use of a dedicated data selection procedure and/or removal of disturbing effects. In a first step all readings are normalised to an altitude of 400 km. For the investigation of the solar influences only magnetically quiet days (Ap≤15) are considered. The dependence on solar flux can well be described by a linear relation within the flux range F10.7=80–240. The slope is twice as steep on the day side as on the night side. The air density exhibits clear annual and semi-annual variations with maxima at the equinoxes and a pronounced minimum around June solstice. The thermosphere maintains during quiet days a day to night mass density ratio very close to 2, which is independent of solar flux level or season. The magnetospheric input causing thermospheric density enhancement can well be parameterised by the am activity index. The low latitude density responds with a delay to changes of the index by about 3 h on the dayside and 4–5 h on the night side. The magnetospheric forcing causes an additive contribution to the quiet-time density, which is linearly correlated with the am index. The slopes of density increases are the same on the day and night sides. We present quantitative expressions for all the dependences. Our results suggest that all the studied forcing terms can be treated as linear combinations of the respective contribution.
IMF dependence of high-latitude thermospheric wind pattern derived from CHAMP cross-track measurements
M. F rster, S. Rentz, W. K hler, H. Liu,S. E. Haaland
Annales Geophysicae (ANGEO) , 2008,
Abstract: Neutral thermospheric wind pattern at high latitudes obtained from cross-track acceleration measurements of the CHAMP satellite above both North and South polar regions are statistically analyzed in their dependence on the Interplanetary Magnetic Field (IMF) direction in the GSM y-z plane (clock angle). We compare this dependency with magnetospheric convection pattern obtained from the Cluster EDI plasma drift measurements under the same sorting conditions. The IMF-dependency shows some similarity with the corresponding high-latitude plasma convection insofar that the larger-scale convection cells, in particular the round-shaped dusk cell for ByIMF+ (ByIMF ) conditions at the Northern (Southern) Hemisphere, leave their marks on the dominant general transpolar wind circulation from the dayside to the nightside. The direction of the transpolar circulation is generally deflected toward a duskward flow, in particular in the evening to nighttime sector. The degree of deflection correlates with the IMF clock angle. It is larger for ByIMF+ than for ByIMF and is systematically larger (~5°) and appear less structured at the Southern Hemisphere compared with the Northern. Thermospheric cross-polar wind amplitudes are largest for BzIMF /ByIMF conditions at the Northern Hemisphere, but for BzIMF /ByIMF+ conditions at the Southern because the magnetospheric convection is in favour of largest wind accelerations over the polar cap under these conditions. The overall variance of the thermospheric wind magnitude at Southern high latitudes is larger than for the Northern. This is probably due to a larger "stirring effect" at the Southern Hemisphere because of the larger distance between the geographic and geomagnetic frameworks.
Climatology of the cusp-related thermospheric mass density anomaly, as derived from CHAMP observations
S. Rentz ,H. Lühr
Annales Geophysicae (ANGEO) , 2008,
Abstract: We report on the thermospheric mass density anomaly in the vicinity of the ionospheric cusp. A systematic survey of the anomalies is presented, based on a statistical analysis of 4 years of data (2002–2005) obtained by the accelerometer onboard CHAMP. The anomalies are detected during all years and seasons in both hemispheres but with stronger signatures in the Northern Hemisphere. For the same geophysical conditions, solar flux and geomagnetic activity the anomalies in the north are larger by a factor of about 1.35. Over the course of the survey period the amplitude decreases by more than a factor of 5 while the level of solar flux reduces by a factor of 2. The anomaly strength also depends on the solar wind input. The merging electric field, Emerg, is generally enhanced for about an hour before the anomaly detection. There is a quadratic response of the anomaly amplitude to Emerg. For geophysical conditions of P10.7<150 and Emerg<1 mV/m hardly any events are detected. Their amplitudes are found to be controlled by an additive effect of P10.7 and Emerg, where the weight of Emerg, in mV/m, is by about 50 times higher than that of the solar flux level. The solar zenith angle and the influence of particle precipitation are found to play a minor role as a controlling parameter of seasonal variation. The well-known annual variation of the thermospheric density with a minimum around June also influences the formation of the cusp anomalies. This leads to a clear hemispheric asymmetry with very weak anomalies in the south during June solstice, which is supposed to be a combined effect of the minimum in annual variation and the seasonal decrease of solar insolation in this region.
Soybean seed protein, oil, fatty acids, N, and S partitioning as affected by node position and cultivar differences  [PDF]
Nacer Bellaloui, Anne M. Gillen
Agricultural Sciences (AS) , 2010, DOI: 10.4236/as.2010.13014
Abstract: The mechanisms controlling the partitioning of seed composition constituents along the main stem in soybean are still controversial. Therefore, the objective of this study was to investigate seed protein, oil, and fatty acids partitioning in soybean cultivars along the main stem. The cultivars were DT97-4290, maturity group (MG) IV; Stressland, MG IV; Hutcheson, MG V; TracyM, MG VI. Seeds were harvested based on position on the plant (top nodes, middle nodes, and bottom nodes). At R8 (physiological maturity stage), DT97-4290, Hutcheson, and Stressland had higher percentage of protein and oleic acid and lower percentage of oil and linolenic acid in top node seed compared with bottom node seed. The increase of protein in top node compared with the bottom node across the two experiments ranged from 15.5 to 19.5%, 7.0 to 10.5%, 14.2 to 15.8%, 11.2 to 16.5%, respectively for DT97-4290, Hutcheson, Stressland, and TracyM. Except for TracyM, the increase of oleic acid in the top node ranged from 45.4 to 93%, depending on the cultivar. Conversely, the decrease in the top node seed ranged from 14.4 to 26.8% for oil and from 5.7 to 34.4% for linolenic acid, depending on the cultivar. The partitioning trend of seed composition constituents at R6 (seed - fill stage) was inconsistent. Except for Stressland, seed oleic acid was higher at R6 than at R8. The higher protein and oleic acid concentrations in the top node seed was accom- panied by higher activity of nitrate reductase activity, higher chlorophyll concentration, higher nitrogen (N) and sulfur (S) percentages in the fully expanded leaves at R5-R6 growth stage, and higher seed nitrogen (N) and sulfur (S) percentages in DT 97-4290 and Stressland. The current research suggests that the partitioning of seed protein, oil, and fatty acids in nodes along the plant depended on the position of node on the main stem, cultivar differences, seed N and S status, and tissue N and S partitioning. The higher nitrate reductase activity at the top nodes, accompanied higher protein and oleic acid, and the changes of oleic acid at R6 and R8 along the stem, were not previously reported, and need further investigation. The current knowledge is useful for soybean germplasm selection for desirable traits such protein and oleic acid, and for accurate measurements of seed composition constituents in breeding lines.
Response Inhibition, Categorization, and Set-Shifting in College Students with ADHD Symptoms  [PDF]
Anne M. Murtagh, Anthony Elworthy
Psychology (PSYCH) , 2014, DOI: 10.4236/psych.2014.57074
Abstract:

Attention-deficit/hyperactivity disorder (ADHD) in college students is not well researched nor well understood, but is likely to present special challenges to academic performance. Individuals with ADHD symptoms have sometimes been found to show deficits in executive functioning, including response inhibition, categorization and set-shifting abilities. However, the relationship between these abilities and ADHD symptoms in college students remains unclear. In the present study, the response inhibition, categorization and set-shifting abilities of college students with low (n = 15), moderate (n = 15), and high (n = 16) self-reported ADHD symptoms were compared. No overall group differences were found. It thus appears that in these important executive functions, college students with high self-reported levels of ADHD symptoms are not more impaired, as compared to those with fewer symptoms. Possibly, the group comparisons obscured a subset of students whose cognitive inhibition, categorization and set-shifting abilities are affected. Other limitations, including the use of self-report and the relatively low sample size, are discussed.

Freedom and Destiny in Ancient Greek Thought: Some Footnotes for Contemporary Scientific Research and Education  [PDF]
Mo?ra Anne Müller
Advances in Historical Studies (AHS) , 2016, DOI: 10.4236/ahs.2016.51002
Abstract: In the history of thought it has been common to inquire about the relation between personal freedom and necessity. The question of self-determination and self-sufficiency was an essential question for the ancient philosophers and poets in their enquiries about how to live a good life. In this paper we will discuss the ancient Greek interpretation of freedom and its collateral of responsibility. This will bring us to three important questions for scientific research and education: 1) Are scientific deliberation and practical wisdom exclusive skills? 2) Is the will an unneeded faculty of the soul? 3) Is the katharsis a footnote for the lucid and robust contemporary state of mind?
Analyzing the Mara River Basin Behaviour through Rainfall-Runoff Modeling  [PDF]
Anne M. Birundu, Benedict M. Mutua
International Journal of Geosciences (IJG) , 2017, DOI: 10.4236/ijg.2017.89064
Abstract:
Hydrological models are considered as necessary tools for water and environmental resource management. However, modelling poorly gauged watersheds has been a challenge to hydrologists and hydraulic engineers. Research done recently has shown the potential to overcome this challenge through incorporating satellite based hydrological and meteorological data in the measured data. This paper presents results for a study that used the semi-distributed conceptual HBV Light Model to model the rainfall-runoff in the Mara River Basin, Kenya. The model simulates runoff as a function of rainfall. It is built on the basis established between satellite observed and in-situ rainfall, evaporation, temperature and the measured runoff. The model’s performance and reliability were evaluated over two sub-catchments namely: Nyangores and Amala in the Mara River Basin using the Nash-Sutcliffe Efficiency which the model referred to as Reff and the coefficient of determination (R2). The Reff for Nyangores and Amala during the calibration and (validation) period were 0.65 (0.68) and 0.59 (0.62) respectively. The model showed good flow simulations particularly during the recession flows, in the Nyangores sub-catchment whereas it simulated poorly the short term fluctuations of the high-flow for Amala sub-catchment. Results from this study can be used by water resources managers to make informed decision on planning and management of water resources.
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