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Search Results: 1 - 10 of 672767 matches for " A. S. Safina "
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Staminate Flower of Cocos Nucifera as Green Inhibitor for Mild Steel in HCl Medium
R. Rajalakshmi,A. S. Safina
Journal of Chemistry , 2012, DOI: 10.1155/2012/138463
Abstract: Corrosion control methods, especially the use of inhibitors, have gained monumental importance in the present scenario of expunging corrosion and the quest for eco-friendly reasons continues. To arrive at an inexpensive non-toxic, eco-friendly inhibitor formulations the present study on the use of Staminate Flower extract of Cocos Nucifera has been carried out by the classical weight loss measurements and electrochemical polarization measurements. The acid extract could bring out a maximum of 97.3% inhibition of mild steel corrosion in 1M HCl. Thermodynamic parameters of the corrosion process were calculated from temperature study. The adsorptive behaviour of Staminate Flower extract in acid solution may be approximated both by Langmuir and Temkin type isotherms. The results obtained by Tafel, Linear polarization resistance, and impedance spectroscopy have been correlated with the classical weight loss measurements. Values of Tafel constant ba and bc confirmed that the Staminate Flower extract acts like mixed type inhibitor. Examination of the surface of the metal in the presence of the inhibitor confirmed the deposition of inhibitor on the metal surface. The Staminate Flower extract in HCl medium efficiently inhibits the corrosion and proved to be zero cost inhibitor, eco-friendly, non-toxic, and highly economical.
Dietary Quality and Comorbidities of Adults at Medical Risk for Diabetes  [PDF]
Joan A. Vaccaro, Daniela Safina, Lauren Grunspan, Fatma G. Huffman
Open Journal of Preventive Medicine (OJPM) , 2014, DOI: 10.4236/ojpm.2014.44019
Abstract:

Background and aims: The current study evaluates following a special diet with diet quality and comorbidities (hypertension, hypercholesterolemia, and obesity) in four racial/ethnic groups diagnosed with prediabetes or “at risk for diabetes”. Methods and results: This is a cross-sectional analysis of data from the National Health and Nutrition Examination Surveys (NHANES), 2007-2008 and 2009-2010. Sample weights were used to achieve a representative sample. Data were available for N = 2666 adults, aged ≥20 years (508 Mexican American, 294, Other Hispanic, 616 Black non-Hispanic, and 1248 White non-Hispanic) who were medically diagnosed with either prediabetes or “at risk for diabetes”. Those reporting following a special diet had greater odds of meeting saturated fat guidelines (<10% of calories) but no greater odds of adequate fiber (14 g/4184 kJ (1000 Kcal)) as compared to those not following a special diet. There was a significant association of following a diet by number of comorbidities. Regardless of race/ethnicity, reporting following a special diet was more likely for those having more comorbidities; however, number of comorbidities was not associated with diet quality. There were racial/ethnic differences in following a special diet and its association with adequate fiber intake for persons having health risks for diabetes. Black non-Hispanics who did not follow a special diet had lower odds of meeting fiber intake requirements. Conclusion: Low adherence (<15%) to fiber dietary guidelines was found across race/ethnicity for adults diagnosed at health risk for diabetes.

Erratum to “Dietary Quality and Comorbidities of Adults at Medical Risk for Diabetes” [Open Journal of Preventive Medicine 4 (2014) 138-144]  [PDF]
Joan A. Vaccaro, Daniela Safina, Lauren Grunspan, Fatma G. Huffman
Open Journal of Preventive Medicine (OJPM) , 2014, DOI: 10.4236/ojpm.2014.46060
Abstract:


The original online version of this article (Vaccaro, J.A., Safina, D., Grunspan, L. and Huffman, F.G. (2014) Dietary Quality and Comorbidities of Adults at Medical Risk for Diabetes. Open Journal of Preventive Medicine, 4, 138-144. http://dx.doi.org/10.4236/ojpm.2014.44019) unfortunately contains a mistake. The authors wish to correct the errors in Table 4, page 142: P-value for the variable Special diet (yes) should read 0.081. And they added (yes) after Special diet for clarity. They moved Race/ethnicity up and presented it without an OR, for clarity.


The 2010 Gulf of Mexico Oil Well Blowout: A Little Hindsight
Carl Safina
PLOS Biology , 2012, DOI: 10.1371/journal.pbio.1001049
Abstract:
The 2010 Gulf of Mexico Oil Well Blowout: A Little Hindsight
Carl Safina
PLOS Biology , 2011, DOI: 10.1371/journal.pbio.1001049
Abstract:
A metallic phase in lightly doped La$_{2-x}$Sr$_{x}$CuO$_{4}$ observed by electron paramagnetic resonance
A. Shengelaya,M. Bruun,B. I. Kochelaev,A. Safina,K. Conder,K. A. Muller
Physics , 2003, DOI: 10.1103/PhysRevLett.93.017001
Abstract: In the low doping range of $x$ from 0.01 to 0.06 in La$_{2-x}$Sr$_{x}$CuO$_{4}$, a narrow electron paramagnetic resonance (EPR) line has been investigated. This line is distinct from the known broad line, both due to probing Mn$^{2+}$ ions. The narrow line is ascribed to metallic regions in the material, and its intensity increases exponentially upon cooling below $\sim$ 150 K. The activation energy deduced $\Delta$ = 460(50) K is nearly the same as that found in the doped superconducting regime by Raman and neutron scattering. The intensity of the narrow EPR line follows the same temperature dependence as the resistivity anisotropy in lightly doped La$_{2-x}$Sr$_{x}$CuO$_{4}$ single crystals.
Historical and Contemporary Factors Contributing to the Plight of Migrant Farmworkers in the United States
Safina Koreishi,Martin Thomas Donohoe
Social Medicine , 2010,
Abstract: : Migrant farmworkers provide an essential service and perform jobs that many Americans are unwilling to do. Immigration practices and policies dictate the extent to which undocumented migrant farmworkers have access to governmental health and social services, and are ever-changing based on the political climate. This paper reviews historical and contemporary United States government policies relevant to migrant farmworkers. It refutes some of the common myths regarding documented and undocumented immigrants and migrant farmworkers, such as "U.S. public health insurance programs are overburdened with immigrants," "undocumented immigrants are taking advantage of the American system by 'free riding' and are a 'drain on the economy,'" and "undocumented immigrants take American jobs." Even though their jobs involve significant occupational hazards, undocumented migrant farmworkers are ineligible for government services, and employers generally do not provide these workers with health insurance. Migrant farmworkers also face food insecurity, poor housing conditions, impaired access to education for their children, and even human rights violations. These conditions, as well as the nature of their work, affect the health of undocumented migrant farmworkers and their children. This paper analyzes these inequities and calls for a more just and equitable system that treats migrant farmworkers fairly and provides them and their families with social services and health care.
On the Complexity of Making a Distinguished Vertex Minimum or Maximum Degree by Vertex Deletion
Sounaka Mishra,Ashwin Pananjady,N Safina Devi
Mathematics , 2013,
Abstract: In this paper, we investigate the approximability of two node deletion problems. Given a vertex weighted graph $G=(V,E)$ and a specified, or "distinguished" vertex $p \in V$, MDD(min) is the problem of finding a minimum weight vertex set $S \subseteq V\setminus \{p\}$ such that $p$ becomes the minimum degree vertex in $G[V \setminus S]$; and MDD(max) is the problem of finding a minimum weight vertex set $S \subseteq V\setminus \{p\}$ such that $p$ becomes the maximum degree vertex in $G[V \setminus S]$. These are known $NP$-complete problems and have been studied from the parameterized complexity point of view in previous work. Here, we prove that for any $\epsilon > 0$, both the problems cannot be approximated within a factor $(1 - \epsilon)\log n$, unless $NP \subseteq DTIME(n^{\log\log n})$. We also show that for any $\epsilon > 0$, MDD(min) cannot be approximated within a factor $(1 -\epsilon)\log n$ on bipartite graphs, unless $NP \subseteq DTIME(n^{\log\log n})$, and that for any $\epsilon > 0$, MDD(max) cannot be approximated within a factor $(1/2 - \epsilon)\log n$ on bipartite graphs, unless $NP \subseteq DTIME(n^{\log\log n})$. We give an $O(\log n)$ factor approximation algorithm for MDD(max) on general graphs, provided the degree of $p$ is $O(\log n)$. We then show that if the degree of $p$ is $n-O(\log n)$, a similar result holds for MDD(min). We prove that MDD(max) is $APX$-complete on 3-regular unweighted graphs and provide an approximation algorithm with ratio $1.583$ when $G$ is a 3-regular unweighted graph. In addition, we show that MDD(min) can be solved in polynomial time when $G$ is a regular graph of constant degree.
Data-driven Workflows for Microservices
Larisa Safina,Manuel Mazzara,Fabrizio Montesi
Computer Science , 2015,
Abstract: Microservices is an architectural style inspired by service-oriented computing that has recently started gaining popularity. Jolie is a programming language based on the microservices paradigm: the main building block of Jolie systems are services, in contrast to, e.g., functions or objects. The primitives offered by the Jolie language elicit many of the recurring patterns found in microservices, like load balancers and structured processes. However, Jolie still lacks some useful constructs for dealing with message types and data manipulation that are present in service-oriented computing. In this paper, we focus on the possibility of expressing choices at the level of data types, a feature well represented in standards for Web Services, e.g., WSDL. We extend Jolie to support such type choices and show the impact of our implementation on some of the typical scenarios found in microservice systems. This shows how computation can move from a process-driven to a data-driven approach, and leads to the preliminary identification of recurring communication patterns that can be shaped as design patterns.
Derivation, Characterization, and Stable Transfection of Induced Pluripotent Stem Cells from Fischer344 Rats
Mikhail Liskovykh, Ilya Chuykin, Ashish Ranjan, Dina Safina, Elena Popova, Elena Tolkunova, Valentina Mosienko, Julia M. Minina, Natalia S. Zhdanova, John J. Mullins, Michael Bader, Natalia Alenina, Alexey Tomilin
PLOS ONE , 2011, DOI: 10.1371/journal.pone.0027345
Abstract: The rat represents an important animal model that, in many respects, is superior to the mouse for dissecting behavioral, cardiovascular and other physiological pathologies relevant to humans. Derivation of induced pluripotent stem cells from rats (riPS) opens the opportunity for gene targeting in specific rat strains, as well as for the development of new protocols for the treatment of different degenerative diseases. Here, we report an improved lentivirus-based hit-and-run riPS derivation protocol that makes use of small inhibitors of MEK and GSK3. We demonstrate that the excision of proviruses does not affect either the karyotype or the differentiation ability of these cells. We show that the established riPS cells are readily amenable to genetic manipulations such as stable electroporation. Finally, we propose a genetic tool for an improvement of riPS cell quality in culture. These data may prompt iPS cell-based gene targeting in rat as well as the development of iPS cell-based therapies using disease models established in this species.
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