Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99


Any time

2020 ( 19 )

2019 ( 88 )

2018 ( 95 )

2017 ( 95 )

Custom range...

Search Results: 1 - 10 of 29236 matches for " Paul Douglas Sanasi "
All listed articles are free for downloading (OA Articles)
Page 1 /29236
Display every page Item
Catalyst Free One-Pot Synthesis of Chromeno Quinolines and Their Antibacterial Activity  [PDF]
Sruthi Vasamsetty, Sunitha Medidi, Satheesh Ampolu, Ravi Kumar Majji, Mastan Rao Kotupalli, Chikurumilli China Satyanarayana, Annapurna Nowduri, Paul Douglas Sanasi
Green and Sustainable Chemistry (GSC) , 2017, DOI: 10.4236/gsc.2017.72011
Abstract: An efficient greener one pot synthesis of dimethyl-dihydro-7H-chromeno[3, 2-h]quinolin-8(9H)-one derivatives has been synthesized through cyclization of aromatic aldehyde, dimidone and 8-hydroxy-quinoline through one-pot condensation method is described. The synthesized compounds are screened for further biological activities against Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus, Bacillus subtilis, Bacillus using cut plate method and disc diffusion method.
Visible Light Photocatalytic Degradation of Methylene Blue and Malachite Green Dyes with CuWO4-GO Nano Composite  [PDF]
Sunitha Medidi, Sowmyasree Markapurapu, Mastan Rao Kotupalli, Rama Krishna Reddy Chinnam, Venkata Mahalakshmi Susarla, Hima Bindu Gandham, Paul Douglas Sanasi
Modern Research in Catalysis (MRC) , 2018, DOI: 10.4236/mrc.2018.72002
Abstract: Copper Tungstate-Graphene Oxide nano composites have been successfully applied as excellent catalysts for the photocatalytic degradation with Methylene blue and Malachite green dyes under visible light irradiation. A facile?solid state metathesis synthesis of copper tungstate (CuWO4) followed by ball milling and subsequent preparation of copper tungstate-graphene oxide?(CuWO4-GO) nano composite using a colloidal blending process and its application as a visible light photocatalyst for the degradation of Malachite green and Methylene blue dyes. The morphology and composition of copper tungstate (CuWO4) nano composite have been characterized using X-Ray Diffraction (XRD), UV-Visible Diffuse Reflectance Spectra (UV-DRS), Raman Spectra, Field Emission Scanning Electron Microscopy (FESEM)-EDS and UV Visible Spectroscopy. It shows a band gap value of 2.13 eV, an increase in range and intensity of light absorption and the reduction of electron-hole pair recombination in CuWO4 with the introducing of GO on to it.
Nano Copper Ferrite Catalyzed Sonochemical, One-Pot Three and Four Component Synthesis of Poly Substituted Imidazoles  [PDF]
Paul D. Sanasi, Ravi K. Majji, Swathi Bandaru, Satyanarayana Bassa, Surekha Pinninti, Sruthi Vasamsetty, Raghu B. Korupolu
Modern Research in Catalysis (MRC) , 2016, DOI: 10.4236/mrc.2016.51004
Abstract: A simple, multi component, one-pot method has been reported for the synthesis of poly substituted imidazoles in presence of magnetically separable and recyclable spinel nano copper ferrite as heterogeneous catalyst by the cyclo-condensation of benzil, aromatic aldehyde, ammonium acetate and substituted amines under ultrasonic irradiation. This method of preparation has many advantages compared to those methods which are previously reported in the literature. This methodology offers simple experimental procedure, milder reaction conditions and environmentally benign approach.
Magnetic Nano Cobalt Ferrite Catalyzed Synthesis of 4H-Pyrano[3,2-h]quinoline Derivatives under Microwave Irradiation  [PDF]
Swathi Bandaru, Ravi K. Majji, Satyanarayana Bassa, Pandu N. Chilla, Ramesh Yellapragada, Sruthi Vasamsetty, Rajendra K. Jeldi, Raghu B. Korupolu, Paul D. Sanasi
Green and Sustainable Chemistry (GSC) , 2016, DOI: 10.4236/gsc.2016.62009
Abstract: A microwave irradiated magnetically separable nano cobalt ferrite catalyzed green method for the synthesis of 4-phenyl-4H-pyrano[3,2-h]quinolin-2-amine and 2-amino-4-phenyl-4H-pyrano[3,2-h] quinoline-3-carbonitrile derivatives through cyclization of aromatic aldehyde, acetonitrile/malononitrile and 8-hydoxyquinoline is developed and presented in this paper. The cubic magnetic cobalt ferrite nano particles were synthesized by sol-gel citrate precursor method and characterized by FT-IR, XRD, SEM and TEM techniques and the structures of the synthesized pyranoquinoline derivatives were assigned by IR, MASS and 1H NMR techniques. The reaction is carried out in a domestic microwave oven with a heat-resistant microwave safe glass container with a lid.
Experimental Investigation of Spoiler Deployment on Wing Stall  [PDF]
Scott Douglas Lindsay, Paul Walsh
Open Journal of Fluid Dynamics (OJFD) , 2018, DOI: 10.4236/ojfd.2018.83019
Abstract: Upper surface wing flaps, known as spoiler, are typically used to reduce lift and increase drag at touchdown; however spoilers have been shown to increase lift and reduce drag at near-stall conditions. The purpose of this experiment was to determine the spoilers’ impact on lift, drag, moment, and aerodynamic efficiency of a NACA 2412 airfoil at angles of attack (α) from 8 ° to 32 °. The experiment was conducted in the Ryerson Low-Speed Wind Tunnel (closed-circuit, 1 m × 1 m test section) at Re=783761, Ma=0.136. The lift coefficient (Cl), drag coefficient (Cd), moment coefficient about the quarter-chord (\"\") were captured with a changing spoiler deflection angle (δ) and spoiler length (b in percent chord). It was found that deflecting the spoiler resulted in an increase maximum lift of up to 2.497%. It was found that deflecting the spoiler by 8° was optimal for the b=10 cases. Any larger deflection reduced the lift gain, and a deflection of 25° caused the maximum lift to be 2.786% less than the clean configuration. In the b=15 case, δ=15° was optimal (1.760% maximum lift coefficient increase). The b=10 cases increased maximum lift coefficient between 0.35% and 2.10% higher than the b=15
Effective Capacity and Randomness of Closed Sets
Douglas Cenzer,Paul Brodhead
Electronic Proceedings in Theoretical Computer Science , 2010, DOI: 10.4204/eptcs.24.11
Abstract: We investigate the connection between measure and capacity for the space of nonempty closed subsets of {0,1}*. For any computable measure, a computable capacity T may be defined by letting T(Q) be the measure of the family of closed sets which have nonempty intersection with Q. We prove an effective version of Choquet's capacity theorem by showing that every computable capacity may be obtained from a computable measure in this way. We establish conditions that characterize when the capacity of a random closed set equals zero or is >0. We construct for certain measures an effectively closed set with positive capacity and with Lebesgue measure zero.
Assessment of blinding to treatment allocation in studies of a cannabis-based medicine (Sativex ) in people with multiple sclerosis: a new approach
Wright Stephen,Duncombe Paul,Altman Douglas G
Trials , 2012, DOI: 10.1186/1745-6215-13-189
Abstract: Background Maintenance of the blind-to-treatment allocation is one of the most important means of avoiding bias in randomised controlled clinical trials. Commonly used methodologies to determine whether patients have become unblinded to treatment allocation are imperfect. This may be of particular concern in studies where outcomes are patient-reported, and with products which have a characteristic adverse event profile. We report the results of an evidence-based statistical approach to exploring the possible impact of unblinding to a cannabis-based medicine (Sativex ) in people with muscle spasticity due to multiple sclerosis. Methods All 666 patients included in three Phase III placebo-controlled studies were included in this analysis. The relationship between factors that might permit patients to identify their treatment allocation and the effect of treatment on the self-reported primary outcome measure was investigated using a general linear model where the dependent variable was the change from baseline in patient self-reported spasticity severity, and the various possible explanatory factors were regarded as fixed factors in the model. Results There was no significant relationship between the effect of Sativex on spasticity and the prior use of cannabis or the incidence of ‘typical’ adverse events. Nor was there any significant relationship between the prior use of cannabis and the incidence of ‘typical’ adverse events, nor between prior use of cannabis and dose of Sativex . Conclusions There is no evidence to suggest that there was widespread unblinding to treatment allocation in these three studies. If any patients did become unblinded, then there is no evidence that this led to bias in the assessment of the treatment difference between Sativex and Placebo for efficacy, adverse events or study drug dosing. This methodology may be suitable for assessment of the integrity of the blind in other randomized clinical trials
D-Brane Stability and Monodromy
Paul S. Aspinwall,Michael R. Douglas
Mathematics , 2001, DOI: 10.1088/1126-6708/2002/05/031
Abstract: We review the idea of Pi-stability for B-type D-branes on a Calabi-Yau manifold. It is shown that the octahedral axiom from the theory of derived categories is an essential ingredient in the study of stability. Various examples in the context of the quintic Calabi-Yau threefold are studied and we plot the lines of marginal stability in several cases. We derive the conjecture of Kontsevich, Horja and Morrison for the derived category version of monodromy around a "conifold" point. Finally, we propose an application of these ideas to the study of supersymmetry breaking.
Uniquely cycle-saturated graphs
Paul S. Wenger,Douglas B. West
Mathematics , 2015,
Abstract: Given a graph $F$, a graph $G$ is {\it uniquely $F$-saturated} if $F$ is not a subgraph of $G$ and adding any edge of the complement to $G$ completes exactly one copy of $F$. In this paper we study uniquely $C_t$-saturated graphs. We prove the following: (1) a graph is uniquely $C_5$-saturated if and only if it is a friendship graph. (2) There are no uniquely $C_6$-saturated graphs or uniquely $C_7$-saturated graphs. (3) For $t\ge6$, there are only finitely many uniquely $C_t$-saturated graphs (we conjecture that in fact there are none).
Multiparameteric PET-MR Assessment of Response to Neoadjuvant Chemoradiotherapy in Locally Advanced Rectal Cancer: PET, MR, PET-MR and Tumor Texture Analysis: A Pilot Study  [PDF]
Ur Metser, Kartik S. Jhaveri, Grainne Murphy, Jaydeep Halankar, Douglas Hussey, Paul Dufort, Erin Kennedy
Advances in Molecular Imaging (AMI) , 2015, DOI: 10.4236/ami.2015.53005
Abstract: Purpose: Patients with locally advanced rectal cancer (LARC) achieving pathologic complete response (pCR) to neoadjuvant chemoradiotherapy (CRT) have significantly improved long term survival. Preoperative detection of pCR may enable a conservative therapeutic approach in some patients. The purpose of the current prospective pilot study was to assess multiparametric qualitative and quantitative MR, PET, PET-MR and tumor texture features in predicting pCR to CRT in patients with LARC. Material and Methods: Eighteen LARC patients underwent staging with FDG-PET and MR-rectum and 15 had post-CRT restaging. Response was assessed qualitatively and quantitatively. SUV (tumor/background), SUV/ADC, and tumor texture parameters derived via machine learning algorithms (MLA) from PET and multiple MR sequences and were correlated with histopathology. Results: A third of patients had pCR. Sensitivity, specificity & accuracy of PET, MR and combined PET-MR were 90, 60, & 80; 90, 20 & 66.7; 90, 80 & 86.7, respectively. Differences did not reach statistical significance. Quantitatively, only tumor-muscle (SUV/ADC) ratio improved prediction of pCR. Of all texture features assessed using MLA, only the classifier trained on pre-treatment PET was significant (p = 0.034; accuracy, 92.8%). Combined PET and MR texture features did not improve performance. Conclusion: Combined PET-MR may improve specificity compared with PET or MR alone, although this needs to be validated in a larger cohort. Tumor to muscle SUV/ADC ratios post-therapy and texture features on baseline PET show promise in improving prediction of pCR post-CRT in LARC.
Page 1 /29236
Display every page Item

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