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Search Results: 1 - 10 of 255355 matches for " David L. Olson "
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Electrochemical Behavior of Titanium and Its Alloys as Dental Implants in Normal Saline
Rahul Bhola,Shaily M. Bhola,Brajendra Mishra,David L. Olson
Advances in Physical Chemistry , 2009, DOI: 10.1155/2009/574359
Abstract: The electrochemical behavior of pure titanium and titanium alloys in a simulated body fluid (normal saline solution) has been tested, and the results have been reported. The significance of the results for dental use has been discussed. The tests also serve as a screening test for the best alloy system for more comprehensive long-term investigations.
Electrochemical Evaluation of Wrought Titanium -15 Molybdenum Alloy for Dental Implant Applications in Phosphate Buffer Saline
Bhola,Rahul; Bhola,Shaily M.; Mishra,Brajendra; Olson,David L.;
Portugaliae Electrochimica Acta , 2010,
Abstract: ti-15mo alloy has been evaluated for its electrochemical behavior in phosphate buffer saline solution at the physiological temperature of 37 oc. a two time constant model of a duplex oxide layer has been used to assess the corrosion behavior of the ti-15mo alloy-solution interface using electrochemical impedance spectroscopy (eis). interfacial characteristics of the inner barrier layer and the outer porous layer have been studied to understand the role of the alloy as an implant. ti-15mo alloy shows a very high barrier layer resistance and a tendency to resist localized corrosion.
Editorial

Xingquan Zhu,Chengqi Zhang,David L Olson,

软件学报 , 2008,
Abstract:
Electrochemical Evaluation of Wrought Titanium -15 Molybdenum Alloy for Dental Implant Applications in Phosphate Buffer Saline
Rahul Bhola,Shaily M. Bhola,Brajendra Mishra,David L. Olson
Portugaliae Electrochimica Acta , 2010,
Abstract: Ti-15Mo alloy has been evaluated for its electrochemical behavior in phosphate buffer saline solution at the physiological temperature of 37 oC. A two time constant model of a duplex oxide layer has been used to assess the corrosion behavior of the Ti-15Mo alloy-solution interface using electrochemical impedance spectroscopy (EIS). Interfacial characteristics of the inner barrier layer and the outer porous layer have been studied to understand the role of the alloy as an implant. Ti-15Mo alloy shows a very high barrier layer resistance and a tendency to resist localized corrosion.
Corrosion Response of Ti6Al4V and Ti15Mo Dental Implant Alloys in the Presence of Listerine Oral Rinse
Rahul Bhola,Charu Chandra,Faisal M. Alabbas,Sukumar Kundu,Brajendra Mishra,David L. Olson
International Journal of Corrosion , 2013, DOI: 10.1155/2013/739841
Abstract: The influence of a commonly used antibacterial mouth rinse, Listerine, on the corrosion behavior of one of the commonly used titanium alloys Ti6Al4V (two-phase structure, i.e., α and β) and a newer Ti15Mo (single β phase) in normal saline solution has been investigated using electrochemical techniques. Interfacial electrochemical changes occurring at the oxide-solution interface have been analysed using EIS circuit modeling. Listerine acts as a corrosion inhibitor for Ti15Mo alloy and a corrosion promoter for Ti6Al4V alloy. 1. Introduction Listerine is a commonly used mouth rinse with antiplaque, anticaries, and antibacterial properties. It is used in several dental applications following periodontal procedures and routine oral prophylaxis. It was awarded the American Dental Association’s seal of recognition in 1987 for its clinical efficacy in plaque control and gingival improvement [1]. Listerine antiseptic, developed by Warner-Lambert, was the first over-the-counter mouth rinse [2]. Listerine contains different essential oils, which are phenolics such as thymol, eucalyptol, menthol, and methyl salicylate and are known to retard plaque buildup and reduce gingivitis [3–10]. Thymol, eucalyptol, and menthol are known to possess proven antibacterial activity and are found in thyme (Thymus vulgaris), eucalyptus (Eucalyptus globulus), and peppermint (Mentha piperita), respectively. Methyl salicylate has anti-inflammatory activity and is found in meadowsweet (Filipendula ulmaria) and willow (Salix spp.) [2]. The effect of Listerine on plaque was ascribed to its bactericidal properties related to the alteration of bacterial cell wall, which has been well documented in vitro and in vivo [11–15]. A newly inserted prosthesis and various surrounding tissues may get exposed to Listerine from minutes to days, depending upon the therapy performed and the local and systemic patient factors. It is thus important to understand the effect of Listerine on the electrochemical and corrosion behavior of titanium alloys in order to predict treatment prognosis. Cestarolli et al. [16] have compared the effect of mouthwashes including Listerine and a simulated body fluid on the corrosion behavior of an Fe-Cr-Ni alloy. The corrosion resistance of this alloy was the highest in the presence of Listerine mouthwash. However, the present study simulates the use of Listerine as an oral prophylactic rinse, in other words, the condition when the concentration of saliva gets altered due to the presence of Listerine in the mouth. The effect of this normal saline-Listerine solution has,
Language, Literacy and Mind: The Literacy Hypothesis
Olson,David R;
Psykhe (Santiago) , 2009, DOI: 10.4067/S0718-22282009000100001
Abstract: literacy is important not only as a means of access to new information and as an extension of memory. rather, it is argued that writing is a means to the awareness of the implicit properties of language. this awareness is expressed through new concepts for referring to what is said, what is meant by it, what it implies, of what it is composed, and the like. writing achieves this effect through distancing the thoughts of the writer from the fixed, objective form it takes when written down. the effect on the reader, correspondingly, is equally distanced from the writer with the result that reading is less like hearing a speaker that like over-hearing. i describe this effect by saying that writing puts language within quotation marks.
Language, Literacy and Mind: The Literacy Hypothesis Lenguaje, Literacidad y Mente: La Hipótesis de la Literacidad
David R Olson
Psykhe (Santiago) , 2009,
Abstract: Literacy is important not only as a means of access to new information and as an extension of memory. Rather, it is argued that writing is a means to the awareness of the implicit properties of language. This awareness is expressed through new concepts for referring to what is said, what is meant by it, what it implies, of what it is composed, and the like. Writing achieves this effect through distancing the thoughts of the writer from the fixed, objective form it takes when written down. The effect on the reader, correspondingly, is equally distanced from the writer with the result that reading is less like hearing a speaker that like over-hearing. I describe this effect by saying that writing puts language within quotation marks. La literacidad no solamente es importante como un medio para acceder a nueva información y como extensión de la memoria. Se propone, en cambio, que la escritura es un medio para tomar conciencia de las propiedades implícitas del lenguaje. Esta toma de conciencia se expresa a través de nuevos conceptos para referirse a lo que se dice, su significado, sus implicancias, los elementos que lo componen y otros aspectos similares. La escritura logra este efecto al distanciar los pensamientos del escritor de la forma fija y objetiva que adquieren al ser escritos. De manera equivalente, el lector vive un proceso de distanciamiento similar al del escritor, con el efecto que leer se parece menos a escuchar directamente a un hablante que a escucharlo sin que este se dé cuenta. Describo estos efectos se alando que la escritura pone al lenguaje entre comillas.
Diagnostic Potential of the NMDA Receptor Peptide Assay for Acute Ischemic Stroke
Svetlana A. Dambinova, Kerstin Bettermann, Theodore Glynn, Matthew Tews, David Olson, Joseph D. Weissman, Richard L. Sowell
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0042362
Abstract: Background The acute assessment of patients with suspected ischemic stroke remains challenging. The use of brain biomarker assays may improve the early diagnosis of ischemic stroke. The main goal of the study was to evaluate whether the NR2 peptide, a product of the proteolytic degradation of N-methyl-D-aspartate (NMDA) receptors, can differentiate acute ischemic stroke (IS) from stroke mimics and persons with vascular risk factors/healthy controls. A possible correlation between biomarker values and lesion sizes was investigated as the secondary objective. Methods and Findings A total of 192 patients with suspected stroke who presented within 72 h of symptom onset were prospectively enrolled. The final diagnosis was determined based on clinical observations and radiological findings. Additionally gender- and age-matched healthy controls (n = 52) and persons with controlled vascular risk factors (n = 48) were recruited to compare NR2 peptide levels. Blinded plasma was assayed by rapid magnetic particles (MP) ELISA for NR2 peptide within 30 min and results for different groups compared using univariate and multivariate statistical analyses. There was a clinical diagnosis of IS in 101 of 192 (53%) and non-stroke in 91 (47%) subjects. The non-stroke group included presented with acute stroke symptoms who had no stroke (n = 71) and stroke mimics (n = 20). The highest NR2 peptide elevations where found in patients with IS that peaked at 12 h following symptom onset. When the biomarker cut off was set at 1.0 ug/L, this resulted in a sensitivity of 92% and a specificity of 96% to detect IS. A moderate correlation (rs = 0.73) between NR2 peptide values and acute ischemic cortical lesions (<200 mL) was found. Conclusions This study suggests that the NR2 peptide may be a brain specific biomarker to diagnose acute IS and may allow the differentiation of IS from stroke mimics and controls. Additional larger scale clinical validation studies are required.
Lower bounds on blowing-up solutions of the 3D Navier--Stokes equations in $\dot H^{3/2}$, $\dot H^{5/2}$, and $\dot B^{5/2}_{2,1}$
David S. McCormick,Eric J. Olson,James C. Robinson,Jose L. Rodrigo,Alejandro Vidal-Lopez,Yi Zhou
Mathematics , 2015,
Abstract: If $u$ is a smooth solution of the Navier--Stokes equations on ${\mathbb R}^3$ with first blowup time $T$, we prove lower bounds for $u$ in the Sobolev spaces $\dot H^{3/2}$, $\dot H^{5/2}$, and the Besov space $\dot B^{5/2}_{2,1}$, with optimal rates of blowup: we prove the strong lower bounds $\|u(t)\|_{\dot H^{3/2}}\ge c(T-t)^{-1/2}$ and $\|u(t)\|_{\dot B^{5/2}_{2,1}}\ge c(T-t)^{-1}$, but in $\dot H^{5/2}$ we only obtain the weaker result $\limsup_{t\to T^-}(T-t)\|u(t)\|_{\dot H^{5/2}}\ge c$. The proofs involve new inequalities for the nonlinear term in Sobolev and Besov spaces, both of which are obtained using a dyadic decomposition of $u$.
Endothelial Transmigration by Trypanosoma cruzi
Bria M. Coates, David P. Sullivan, Ming Y. Makanji, Nga Y. Du, Cheryl L. Olson, William A. Muller, David M. Engman, Conrad L. Epting
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0081187
Abstract: Chagas heart disease, the leading cause of heart failure in Latin America, results from infection with the parasite Trypanosoma cruzi. Although T. cruzi disseminates intravascularly, how the parasite contends with the endothelial barrier to escape the bloodstream and infect tissues has not been described. Understanding the interaction between T. cruzi and the vascular endothelium, likely a key step in parasite dissemination, could inform future therapies to interrupt disease pathogenesis. We adapted systems useful in the study of leukocyte transmigration to investigate both the occurrence of parasite transmigration and its determinants in vitro. Here we provide the first evidence that T. cruzi can rapidly migrate across endothelial cells by a mechanism that is distinct from productive infection and does not disrupt monolayer integrity or alter permeability. Our results show that this process is facilitated by a known modulator of cellular infection and vascular permeability, bradykinin, and can be augmented by the chemokine CCL2. These represent novel findings in our understanding of parasite dissemination, and may help identify new therapeutic strategies to limit the dissemination of the parasite.
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