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Search Results: 1 - 10 of 172030 matches for " Nathan E. Hall "
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Metacognitive Strategies and Test Performance: An Experience Sampling Analysis of Students' Learning Behavior
Ulrike E. Nett,Thomas Goetz,Nathan C. Hall,Anne C. Frenzel
Education Research International , 2012, DOI: 10.1155/2012/958319
Abstract: The aim of the present study was to explore students’ learning-related cognitions prior to an in-class achievement test, with a focus on metacognitive strategy use. A sample of 70 students in grade 11 (58.6% female, years) completed a series of structured, state-based measures over a two-week period via the experience sampling method until the day before a class test. Results illustrated students’ self-regulatory ability to preserve their motivational and cognitive resources, with test-related cognitions evidenced significantly more often in learning-related as opposed leisure settings. Metacognitive strategy use was also found to significantly increase as the test date approached underscoring the goal-oriented nature of situated learning behaviors. Higher intercepts and increases in frequency of test-related cognitions over time positively corresponded to test performance. Of the three metacognitive strategies assessed, monitoring was found to positively correspond with test performance. Implications for future practice as well as implications for future research employing the experience sampling method are discussed.
Metacognitive Strategies and Test Performance: An Experience Sampling Analysis of Students' Learning Behavior
Ulrike E. Nett,Thomas Goetz,Nathan C. Hall,Anne C. Frenzel
Education Research International , 2012, DOI: 10.1155/2012/958319
Abstract: The aim of the present study was to explore students’ learning-related cognitions prior to an in-class achievement test, with a focus on metacognitive strategy use. A sample of 70 students in grade 11 (58.6% female, years) completed a series of structured, state-based measures over a two-week period via the experience sampling method until the day before a class test. Results illustrated students’ self-regulatory ability to preserve their motivational and cognitive resources, with test-related cognitions evidenced significantly more often in learning-related as opposed leisure settings. Metacognitive strategy use was also found to significantly increase as the test date approached underscoring the goal-oriented nature of situated learning behaviors. Higher intercepts and increases in frequency of test-related cognitions over time positively corresponded to test performance. Of the three metacognitive strategies assessed, monitoring was found to positively correspond with test performance. Implications for future practice as well as implications for future research employing the experience sampling method are discussed. 1. Introduction Metacognitive competencies have over the past three decades developed from a largely neglected issue to one of the most elaborated areas of theory and research in the educational sciences [1, 2]. Since the pioneering work of Flavell [3], the concept of metacognition has become inextricably linked with learning theories [4] and nearly equated with the construct of self-regulated learning in terms of planning, monitoring, and evaluation of learning and problem solving [5, 6]. This immense growth in interest is largely due to an emerging consensus among policy makers, teachers, educators, parents, and researchers concerning the importance of fostering students’ ability to autonomously direct their learning processes [5]. In light of the present societal emphasis on lifelong learning and economic climate requiring individuals to rapidly acquire new employment skills, this increase in theoretical and empirical interest in individuals’ metacognitive ability to independently and efficiently regulate their learning is likely to continue. Despite considerable research on metacognitive strategies, several questions warrant further investigation. More specifically, how often and when are metacognitive strategies applied in a learning process (e.g., when is it best to start to prepare for a test)? Which metacognitive learning strategies are most commonly employed in actual learning situations and most effective with respect to
CD81 Is Essential for the Re-entry of Hematopoietic Stem Cells to Quiescence following Stress-Induced Proliferation Via Deactivation of the Akt Pathway
Kuanyin K. Lin,Lara Rossi,Nathan C. Boles,Brian E. Hall,Thaddeus C. George,Margaret A. Goodell
PLOS Biology , 2012, DOI: 10.1371/journal.pbio.1001148
Abstract: The regulatory mechanisms governing the cell cycle progression of hematopoietic stem cells (HSCs) are well characterized, but those responsible for the return of proliferating HSCs to a quiescent state remain largely unknown. Here, we present evidence that CD81, a tetraspanin molecule acutely responsive to proliferative stress, is essential for the maintenance of long-term repopulating HSCs. Cd81?/? HSCs showed a marked engraftment defect when transplanted into secondary recipient mice and a significantly delayed return to quiescence when stimulated to proliferate with 5-fluorouracil (5FU). In addition, we found that CD81 proteins form a polarized patch when HSCs are returning to quiescence. Thus, we propose that the spatial distribution of CD81 during the HSC recovery phase drives proliferative HSC to quiescence, and is important to preserve the self-renewal properties. Here, we show that lack of CD81 leads to loss of HSC self-renewal, and the clustering of CD81 on HSC membrane results in deactivation of Akt, which subsequently leads to nuclear translocation of FoxO1a. Thus, CD81 functions as part of a previously undefined mechanism that prohibits excessive proliferation of HSCs exposed to environmental stress.
CD81 Is Essential for the Re-entry of Hematopoietic Stem Cells to Quiescence following Stress-Induced Proliferation Via Deactivation of the Akt Pathway
Kuanyin K. Lin,Lara Rossi,Nathan C. Boles,Brian E. Hall,Thaddeus C. George,Margaret A. Goodell
PLOS Biology , 2011, DOI: 10.1371/journal.pbio.1001148
Abstract: The regulatory mechanisms governing the cell cycle progression of hematopoietic stem cells (HSCs) are well characterized, but those responsible for the return of proliferating HSCs to a quiescent state remain largely unknown. Here, we present evidence that CD81, a tetraspanin molecule acutely responsive to proliferative stress, is essential for the maintenance of long-term repopulating HSCs. Cd81?/? HSCs showed a marked engraftment defect when transplanted into secondary recipient mice and a significantly delayed return to quiescence when stimulated to proliferate with 5-fluorouracil (5FU). In addition, we found that CD81 proteins form a polarized patch when HSCs are returning to quiescence. Thus, we propose that the spatial distribution of CD81 during the HSC recovery phase drives proliferative HSC to quiescence, and is important to preserve the self-renewal properties. Here, we show that lack of CD81 leads to loss of HSC self-renewal, and the clustering of CD81 on HSC membrane results in deactivation of Akt, which subsequently leads to nuclear translocation of FoxO1a. Thus, CD81 functions as part of a previously undefined mechanism that prohibits excessive proliferation of HSCs exposed to environmental stress.
Prediction of Adherence to a 9-Week Corporate Wellness Walking Program  [PDF]
Megan Flynn, Eric E. Hall
Health (Health) , 2018, DOI: 10.4236/health.2018.1012131
Abstract: The health and economic benefits of workplace wellness programs are well founded, but the favorable results only occur when employees choose to participate and adhere to these programs. The objective of this study was to use the Theory of Planned Behavior and Self-Efficacy Theory to predict whether participants adhered to a corporate wellness walking program. The sample consisted of 110 faculty and staff at a private university who enrolled in a walking program through the university’s wellness center. Participants completed surveys at the beginning of the program. The surveys measured self-reported physical activity, as well as theoretical construct of self-efficacy and those related to the Theory of Planned Behavior—attitude, social norms, perceived behavioral control and intention. Sixty percent of participants were found to meet the program’s goals. Self-reported physical activity (p = 0.036), barrier self-efficacy (p = 0.016), walking self-efficacy (p = 0.002), and intention (p < 0.001) were greater in those who met the goals than those who did not meet the goals of the program. Walking self-efficacy (p < 0.001), attitude (p < 0.001) and perceived behavioral control (p = 0.024) were all found to predict intention to walk and intention was a significant predictor of whether or not the participants met goals of the program (p = 0.022). This suggests behavioral interventions aimed at increasing participant self-efficacy and intentions could positively affect program adherence and the successfulness of a workplace wellness program.
Channel Evolution of Sandy Reservoir Sediments Following Low-Head Dam Removal, Ottawa River, Northwestern Ohio, U.S.A.  [PDF]
Nathan Harris, James E. Evans
Open Journal of Modern Hydrology (OJMH) , 2014, DOI: 10.4236/ojmh.2014.42004
Abstract:
Dozens of low-head dams are removed annually for reasons of obsolescence, financial liability, public safety, or as part of aquatic ecosystem restoration. Prior to removing a dam, hydrologic and sedimentologic studies are used to predict channel changes that would occur after the proposed dam removal. One commonly used predictive approach is a channel evolution model (CEM). However, most CEMs assume that the reservoir has trapped cohesive silts and muds. This study looks at the effects of low-head dam removal on a reservoir in filled with sand-rich sediment. The Secor Dam (2.5 m tall, 17 m wide) was constructed on the Ottawa River in northwestern Ohio (USA) during 1928 and was removed in 2007. High resolution channel cross-sections were measured at 17 locations prior to dam removal and re-measured every approximately 30 days for 6 months following the removal. Sediment sampling, sediment traps, substrate sampling, differential GPS tracking of channel bed forms and sediment coring were also used to characterize the channel sediment response to dam removal. Breaching of the dam produced a diffuse nickzone which was the width of the channel and about 10 m in length. One initial response was downstream migration of a sediment wave at rates up to 0.5 m/hr. The overall effect was erosion of the former reservoir to a distance of 150 m upstream of the former dam. Portions of the former reservoir were incised >1 m. Within the first 6 months after removal, approximately 800 m3 of sand had been mobilized from the former reservoir, transported downstream past the former dam, and had primarily in-filled pre-existing pools within a reach approximately 150 m downstream of the former dam. This behavior significantly differs from the predicted results of current CEMs which anticipate a first flush of suspended sediment and minor deposition of bed load materials in the channel downstream of the former dam.
PET imaging in differentiated thyroid cancer: where does it fit and how do we use it?
Hall, Nathan C.;Kloos, Richard T.;
Arquivos Brasileiros de Endocrinologia & Metabologia , 2007, DOI: 10.1590/S0004-27302007000500017
Abstract: positron emission tomography (pet) is a rapidly evolving imaging modality that has gained widespread acceptance in oncology, with several radionuclides applicable to thyroid cancer. thyroid cancer patients have been studied most commonly using 18f-fluorodeoxyglucose (fdg)-pet, with perhaps the greatest utility being the potential localization of tumor in differentiated thyroid cancer (dtc) patients who are radioiodine whole body scan (wbs) negative and thyroglobulin (tg) positive. also of value is the identification of patients unlikely to benefit from additional 131i therapy and identification of patients at highest risk of disease-specific mortality, which may prompt more aggressive therapy or enrollment in clinical trials. emerging data suggest that pet/ct fusion studies provide increased accuracy and modify the treatment plan in a significant number of dtc cases when compared to pet images alone. however, studies documenting improvements in survival and tumor recurrence attributable to fdg-pet imaging in thyroid cancer patients are lacking. specific case examples of thyroid cancer patients who appear to have benefited from fdg-pet imaging do exist, while less data are available in the setting of anaplastic or medullary thyroid carcinoma. this article reviews the utility and limitations of fdg-pet in dtc management, and offers practical recommendations.
Multimodal imaging and detection approach to 18F-FDG-directed surgery for patients with known or suspected malignancies: a comprehensive description of the specific methodology utilized in a single-institution cumulative retrospective experience
Stephen P Povoski, Nathan C Hall, Douglas A Murrey, Andrew Z Chow, Jay R Gaglani, Eamonn E Bahnson, Cathy M Mojzisik, Maureen P Kuhrt, Charles L Hitchcock, Michael V Knopp, Edward W Martin
World Journal of Surgical Oncology , 2011, DOI: 10.1186/1477-7819-9-152
Abstract: From June 2005-June 2010, 145 patients were injected with 18F-FDG in anticipation of surgical exploration, biopsy, and possible resection of known/suspected malignancy. Each patient underwent one or more of the following: (1) same-day preoperative patient diagnostic PET/CT imaging, (2) intraoperative gamma probe assessment, (3) clinical PET/CT specimen scanning of whole surgically resected specimens (WSRS), research designated tissues (RDT), and/or sectioned research designated tissues (SRDT), (4) micro PET/CT specimen scanning of WSRS, RDT, and/or SRDT, (5) total radioactivity counting of each SRDT piece by an automatic gamma well counter, and (6) same-day postoperative patient diagnostic PET/CT imaging.Same-day 18F-FDG injection dose was 15.1 (± 3.5, 4.6-26.1) mCi. Fifty-five same-day preoperative patient diagnostic PET/CT scans were performed. One hundred forty-two patients were taken to surgery. Three of the same-day preoperative patient diagnostic PET/CT scans led to the cancellation of the anticipated surgical procedure. One hundred forty-one cases utilized intraoperative gamma probe assessment. Sixty-two same-day postoperative patient diagnostic PET/CT scans were performed. WSRS, RDT, and SRDT were scanned by clinical PET/CT imaging and micro PET/CT imaging in 109 and 32 cases, 33 and 22 cases, and 49 and 26 cases, respectively. Time from 18F-FDG injection to same-day preoperative patient diagnostic PET/CT scan, intraoperative gamma probe assessment, and same-day postoperative patient diagnostic PET/CT scan were 73 (± 9, 53-114), 286 (± 93, 176-532), and 516 (± 134, 178-853) minutes, respectively. Time from 18F-FDG injection to scanning of WSRS, RDT, and SRDT by clinical PET/CT imaging and micro PET/CT imaging were 389 (± 148, 86-741) and 458 (± 97, 272-656) minutes, 619 (± 119, 253-846) and 661 (± 117, 433-835) minutes, and 674 (± 186, 299-1068) and 752 (± 127, 499-976) minutes, respectively.Our multimodal imaging and detection approach to 18F-FDG-directed s
Impacts of Zebra Mussel Veliger Control Treatments on the Survival of Water-Hardened Landlocked Fall Chinook Salmon Eggs  [PDF]
Sierra Hillard, Nathan Huysman, Michael E. Barnes
Natural Resources (NR) , 2019, DOI: 10.4236/nr.2019.104008
Abstract:
Several treatment options have been developed to minimize the spread of zebra mussel Dreissena polymorphaveligers (larvae) during fish transportation. However, the effect of these treatments on the survival of newly-fertilized salmonid eggs has not been evaluated. This study examined the survival of water-hardened landlocked fall Chinook salmon Oncorhynchus tshawytscha eggs after one of four different treatments: 1) Control (no chemicals), 2) 100 mg/L formalin for two hours, 3) 750 mg/L of potassium chloride for one hour followed by 20 mg/L formalin for two hours, and 4) 750 mg/L of potassium chloride for one hour followed by 20 mg/L formalin for three hours. The 100 mg/L formalin treatment produced complete egg mortality. Survival to hatch was not significantly different among the other three treatments. Based on these results, the use of 750 mg/L potassium chloride for one hour followed by 20 mg/L formalin for three hours is recommended when moving Chinook salmon eggs from waters potentially infested with zebra mussels to hatcheries for incubation.
Social Work Practice with Pakistani-American Families: The Implications of Spirituality vis-?-vis Islam
Ronald E. Hall
Pakistan Journal of Social Sciences , 2012,
Abstract: In the aftermath of September 11th, 2001 spiritualism has become apparent as critical to Social Work practice with Pakistani families. Regrettably, research on such families today is all-but non-existent. Their belief in Islam is the fastest growing form of spirituality in Central Asia. Social Workers who do not acknowledge this fact will be at a severe disadvantage in their attempts to treat Pakistani-American clientele. It is not compulsory that practitioners endorse client belief systems or other aspects of their spirituality, but practitioners should acknowledge said systems as a critical point in the client`s frame of reference. In the interest of social justice they are thus challenged to develop creative treatment strategies less confined to Western bias.
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