oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 261 )

2018 ( 541 )

2017 ( 532 )

2016 ( 762 )

Custom range...

Search Results: 1 - 10 of 449722 matches for " C. J. Moomaw "
All listed articles are free for downloading (OA Articles)
Page 1 /449722
Display every page Item
The Adverse Effect of Spasticity on 3-Month Poststroke Outcome Using a Population-Based Model
S. R. Belagaje,C. Lindsell,C. J. Moomaw,K. Alwell,M. L. Flaherty,D. Woo,K. Dunning,P. Khatri,O. Adeoye,D. Kleindorfer,J. Broderick,B. Kissela
Stroke Research and Treatment , 2014, DOI: 10.1155/2014/696089
Abstract: Several devices and medications have been used to address poststroke spasticity. Yet, spasticity’s impact on outcomes remains controversial. Using data from a cohort of 460 ischemic stroke patients, we previously published a validated multivariable regression model for predicting 3-month modified Rankin Score (mRS) as an indicator of functional outcome. Here, we tested whether including spasticity improved model fit and estimated the effect spasticity had on the outcome. Spasticity was defined by a positive response to the question “Did you have spasticity following your stroke?” on direct interview at 3 months from stroke onset. Patients who had expired by 90 days or did not have spasticity data available were excluded. Spasticity affected the 3-month functional status ( , to 0.645) after accounting for age, diabetes, leukoaraiosis, and retrospective NIHSS. Using spasticity as a covariable, the model’s changed from 0.599 to 0.622. In our model, the presence of spasticity in the cohort was associated with a worsened 3-month mRS by an average of 0.4 after adjusting for known covariables. This significant adverse effect on functional outcomes adds predictive value beyond previously established factors. 1. Introduction Spasticity is defined as a motor disorder characterized by a velocity-dependent increase in tonic stretch reflexes with exaggerated tendon jerks, resulting from hyperexcitability of the stretch reflex. The definition, however, fails to describe the complex etiologies of spasticity, especially after a stroke. It can be due to a loss of upper motor neuron function, changes in the properties of the muscle membranes, augmentation of prior reflexes, or a combination of the above. Equally unclear is spasticity’s effect on poststroke recovery. There are some reports which suggest adverse effects on recovery. In a longitudinal study of 95 subjects, Sommerfeld et al. found that, at 3-month poststroke, patients without spasticity had statistically significant better motor and activity scores than patients with spasticity [1]. However, there are others who argue that spasticity’s effects are being overstated, specifically by mentioning the absence of evidence to suggest that treatment of spasticity improves stroke recovery [2]. In fact multiple medications and treatments of spasticity have been developed and are used routinely in the clinical setting for poststroke spasticity. The literature describes improvements in passive function only and reduction in disability after botulinum toxin administration to spastic muscles [3–5]. In their approval of
Predicting Mortality and Functional Outcomes after Ischemic Stroke: External Validation of a Prognostic Model  [PDF]
Achala Vagal, Heidi Sucharewv, Christopher Lindsell, Dawn Kleindorfer, Kathleen Alwell, Charles J. Moomaw, Daniel Woo, Matthew Flaherty, Pooja Khatri, Opeolu Adeoye, Simona Ferioli, Jason Mackey, Sharyl Martini, Felipe De Los Rios La Rosa F., Brett Kissela
Journal of Behavioral and Brain Science (JBBS) , 2018, DOI: 10.4236/jbbs.2018.810036
Abstract: Background: We previously developed predictive models for 3-month mortality and modified Rankin Score (mRS) after ischemic stroke. Aim: The aim was to test model validity for 3-month mortality and mRS after ischemic stroke in two independent data sets. Methods: Our derivation models used data from 451 subjects with ischemic stroke in 1999 enrolled in the Greater Cincinnati/Northern Kentucky Stroke Study (GCKNSS). We utilized two separate cohorts of ischemic strokes through GCKNSS (460 in 2005 and 504 in 2010) to assess external validity by utilizing measures of agreement between predicted and observed values, calibration, and discrimination using Transparent Reporting of a multivariable prediction model for Individual Prognosis or Diagnosis. Results: The 3-month mortality model performed well in the validation datasets with an average prediction error (Brier score) of 0.045 for 2005 and 0.053 for 2010 and excellent discrimination with an area under the curve of 0.86 (95% CI: 0.79, 0.93) for 2005 and 0.84 (0.76, 0.92) for 2010. Predicted 3-month mRS also performed well in the validation datasets with R2 of 0.57 for 2005 and 0.50 for 2010 and a root mean square error of 0.85 for 2005 and 1.05 for 2010. Predicted mRS tended to be higher than actual in both validation datasets. Re-estimation of the model parameters for age and severe white matter hyperintensity in both 2005 and 2010, and for diabetes in 2005, improved predictive accuracy. Conclusions: Our previously developed stroke models performed well in two study periods, suggesting validity of the model predictions.
Kinetic and Spectroscopic Studies of Bicupin Oxalate Oxidase and Putative Active Site Mutants
Ellen W. Moomaw, Eric Hoffer, Patricia Moussatche, John C. Salerno, Morgan Grant, Bridget Immelman, Richard Uberto, Andrew Ozarowski, Alexander Angerhofer
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0057933
Abstract: Ceriporiopsis subvermispora oxalate oxidase (CsOxOx) is the first bicupin enzyme identified that catalyzes manganese-dependent oxidation of oxalate. In previous work, we have shown that the dominant contribution to catalysis comes from the monoprotonated form of oxalate binding to a form of the enzyme in which an active site carboxylic acid residue must be unprotonated. CsOxOx shares greatest sequence homology with bicupin microbial oxalate decarboxylases (OxDC) and the 241-244DASN region of the N-terminal Mn binding domain of CsOxOx is analogous to the lid region of OxDC that has been shown to determine reaction specificity. We have prepared a series of CsOxOx mutants to probe this region and to identify the carboxylate residue implicated in catalysis. The pH profile of the D241A CsOxOx mutant suggests that the protonation state of aspartic acid 241 is mechanistically significant and that catalysis takes place at the N-terminal Mn binding site. The observation that the D241S CsOxOx mutation eliminates Mn binding to both the N- and C- terminal Mn binding sites suggests that both sites must be intact for Mn incorporation into either site. The introduction of a proton donor into the N-terminal Mn binding site (CsOxOx A242E mutant) does not affect reaction specificity. Mutation of conserved arginine residues further support that catalysis takes place at the N-terminal Mn binding site and that both sites must be intact for Mn incorporation into either site.
Protein Similarity Networks Reveal Relationships among Sequence, Structure, and Function within the Cupin Superfamily
Richard Uberto, Ellen W. Moomaw
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0074477
Abstract: The cupin superfamily is extremely diverse and includes catalytically inactive seed storage proteins, sugar-binding metal-independent epimerases, and metal-dependent enzymes possessing dioxygenase, decarboxylase, and other activities. Although numerous proteins of this superfamily have been structurally characterized, the functions of many of them have not been experimentally determined. We report the first use of protein similarity networks (PSNs) to visualize trends of sequence and structure in order to make functional inferences in this remarkably diverse superfamily. PSNs provide a way to visualize relatedness of structure and sequence among a given set of proteins. Structure- and sequence-based clustering of cupin members reflects functional clustering. Networks based only on cupin domains and networks based on the whole proteins provide complementary information. Domain-clustering supports phylogenetic conclusions that the N- and C-terminal domains of bicupin proteins evolved independently. Interestingly, although many functionally similar enzymatic cupin members bind the same active site metal ion, the structure and sequence clustering does not correlate with the identity of the bound metal. It is anticipated that the application of PSNs to this superfamily will inform experimental work and influence the functional annotation of databases.
Cascading costs: An economic nitrogen cycle
William R. Moomaw,Melissa B. L. Birch
Science China Life Sciences , 2005, DOI: 10.1007/BF03187109
Abstract: The chemical nitrogen cycle is becoming better characterized in terms of fluxes and reservoirs on a variety of scales. Galloway has demonstrated that reactive nitrogen can cascade through multiple ecosystems causing environmental damage at each stage before being denitrified to N2. We propose to construct a parallel economic nitrogen cascade (ENC) in which economic impacts of nitrogen fluxes can be estimated by the costs associated with each stage of the chemical cascade. Using economic data for the benefits of damage avoided and costs of mitigation in the Chesapeake Bay basin, we have constructed an economic nitrogen cascade for the region. Since a single tonne of nitrogen can cascade through the system, the costs also cascade. Therefore evaluating the benefits of mitigating a tonne of reactive nitrogen released needs to consider the damage avoided in all of the ecosystems through which that tonne would cascade. The analysis reveals that it is most cost effective to remove a tonne of nitrogen coming from combustion since it has the greatest impact on human health and creates cascading damage through the atmospheric, terrestrial, aquatic and coastal ecosystems. We will discuss the implications of this analysis for determining the most cost effective policy option for achieving environmental quality goals.
A Comparison of Sufficiency Condtions for the Goldbach and the Twin Primes Conjectures  [PDF]
C. J. Mozzochi
Advances in Pure Mathematics (APM) , 2014, DOI: 10.4236/apm.2014.45021
Abstract:

It is generally known that under the generalized Riemann hypothesis one could establish the twin primes conjecture by the circle method, provided one could obtain the estimate o (nlog-2 n) for the integral of the representation function over the minor arcs. One of the new results here is that the assumption of GRH can be removed. We compare this and other such sufficiency results with similar results for the Goldbach conjecture.

Using Microgripper in Development of Automatic Adhesive Glue Transferring and Binding Microassembly System  [PDF]
R. J. CHANG, C. C. CHEN
Engineering (ENG) , 2010, DOI: 10.4236/eng.2010.21001
Abstract: A system using microgripper for gluing and adhesive bonding in automatic microassembly was designed, implemented, and tested. The development of system is guided by axiomatic design principle. With a compliant PU microgripper, regional-edge-statistics (RES) algorithm, and PD controller, a visual-servoing system was implemented for gripping micro object, gluing adhesive, and operating adhesive bonding. The RES algorithm estimated and tracked a gripper’s centroid to implement a visual-servoing control in the microassembly operation. The main specifications of the system are: gripping range of 60~80μm, working space of 7mm×5.74mm×15mm, system bandwidth of 15Hz. In the performance test, a copper rod with diameter 60μm was automatically gripped and transported for transferring glue and bonding. The 60μm copper rod was dipped into a glue container and moved, pressed and bonding to a copper rod of 380μm. The amount of binding glue was estimated about 5.7nl.
Subarachnoid hemorrhage: tests of association with apolipoprotein E and elastin genes
Ritesh Kaushal, Daniel Woo, Prodipto Pal, Mary Haverbusch, Huifeng Xi, Charles Moomaw, Padmini Sekar, Brett Kissela, Dawn Kleindorfer, Matthew Flaherty, Laura Sauerbeck, Ranajit Chakraborty, Joseph Broderick, Ranjan Deka
BMC Medical Genetics , 2007, DOI: 10.1186/1471-2350-8-49
Abstract: At the APOE locus, no individual SNP was associated with SAH after correction for multiple comparisons. Haplotype analysis revealed significant association of the major haplotype (Hap1) in APOE with SAH (p = 0.001). The association stemmed from both the 5' promoter and the 3' region of the APOE gene. APOE ε2 and ε 4 were not significantly associated with SAH. No association was observed for ELN at genotype, allele, or haplotype level and our study failed to confirm previous reports of ELN association with aneurysmal SAH.This study suggests a role of the APOE gene in the etiology of aneurysmal SAH.Non-traumatic, spontaneous subarachnoid hemorrhage (SAH) affects 16,000 to 17,000 individuals each year in the United States [1-3]. SAH has a 30-day mortality rate exceeding 40%, and surviving patients often demonstrate significant morbidity [2,4]. Over 80% of SAH can be attributed to intracranial aneurysm (IA) rupture. Familial aggregation studies of SAH have consistently identified an increased risk of a first-degree relative with SAH or family history of SAH independent of smoking and hypertension [5].Variants of the apolipoprotein E (APOE) gene have been associated with Alzheimer's disease, lipid disorders and cardiovascular disease [6-8]. Previous studies have demonstrated that APOE ε4 and/or APOE ε2 are associated with lobar intracerebral hemorrhage (ICH) [9,10]. We recently reported that haplotypes which include polymorphisms in the 5' untranslated region of the APOE gene are risk factors for lobar ICH [11]. Specific to SAH, Kokubo et al. [12] found significant association of APOE ε4 with SAH in a Japanese population. Niskakangas et al. [13] reported association of APOE ε4 with adverse outcome after aneurysmal SAH. No study on other polymorphisms of APOE with regard to risk of SAH has yet been reported.In addition to APOE, the elastin (ELN) gene emerged as a putative gene for IA after linkage was found on 7q11, where ELN is located [14]. However, prior association st
The evaluation of gold contacts
J. C. C.
Gold Bulletin , 1972, DOI: 10.1007/BF03215170
Abstract: The International Conferences on Electric Contact Phenomena organised by the Illinois Institute of Technology have become an annual feature in their field. At the sixth meeting, held in Chicago in June, a number of papers were concerned with the design and performance of gold contacts and the evaluation of testing methods.
Diffusion and precipitation of gold in lead
J. C. C.
Gold Bulletin , 1973, DOI: 10.1007/BF03215021
Abstract:
Page 1 /449722
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.