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Search Results: 1 - 10 of 3790 matches for " metabolic oscillation "
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Quantifying periodicity in omics data
Masaru Tomita,Douglas B. Murray
Frontiers in Cell and Developmental Biology , 2014, DOI: 10.3389/fcell.2014.00040
Abstract: Oscillations play a significant role in biological systems, with many examples in the fast, ultradian, circadian, circalunar, and yearly time domains. However, determining periodicity in such data can be problematic. There are a number of computational methods to identify the periodic components in large datasets, such as signal-to-noise based Fourier decomposition, Fisher's g-test and autocorrelation. However, the available methods assume a sinusoidal model and do not attempt to quantify the waveform shape and the presence of multiple periodicities, which provide vital clues in determining the underlying dynamics. Here, we developed a Fourier based measure that generates a de-noised waveform from multiple significant frequencies. This waveform is then correlated with the raw data from the respiratory oscillation found in yeast, to provide oscillation statistics including waveform metrics and multi-periods. The method is compared and contrasted to commonly used statistics. Moreover, we show the utility of the program in the analysis of noisy datasets and other high-throughput analyses, such as metabolomics and flow cytometry, respectively.
Forced Oscillation of Solutions of a Fractional Neutral Partial Functional Differential Equation  [PDF]
V. Sadhasivam, J. Kavitha
Applied Mathematics (AM) , 2015, DOI: 10.4236/am.2015.68124
Abstract: In this paper, we will establish the sufficient conditions for the oscillation of solutions of neutral time fractional partial differential equation of the form
\"\"
\"\"for where Ω??is a bounded domain in RN with a piecewise smooth boundary \"\"?is a constant, \"\" is the Riemann-Liouville fractional derivative of order a?of u with respect to t and \"\" is the Laplacian operator in the Euclidean N-space RN subject to the condition\"\"
Forced Oscillation of Nonlinear Impulsive Hyperbolic Partial Differential Equation with Several Delays  [PDF]
Vadivel Sadhasivam, Jayapal Kavitha, Thangaraj Raja
Journal of Applied Mathematics and Physics (JAMP) , 2015, DOI: 10.4236/jamp.2015.311175
Abstract: In this paper, we study oscillatory properties of solutions for the nonlinear impulsive hyperbolic equations with several delays. We establish sufficient conditions for oscillation of all solutions.
Numerical Analysis on the Oscillator of External Stimulation and Self-Excited  [PDF]
Junlong Li, Jiupeng Zou
Journal of Applied Mathematics and Physics (JAMP) , 2016, DOI: 10.4236/jamp.2016.48156
Abstract:
In this article, the performance of the novel external stimulation oscillator and the optimized self- excited oscillator has been investigated by CFD numerical simulation. The efficiency and stimulation mechanism of the two kinds of oscillators were analyzed in numeric form. The cycle proportion of wall-attached jet switching time was calculated separately at different operating frequency. Additionally the reason for the difference of two oscillators was analyzed and explained.
Metabolic Syndrome in People with HIV/AIDS  [PDF]
Ana Paula Werberich, Juliana Ceren, Jayder Lucas Hotts Romancini, Giuliano Gomes de Assis Pimentel, Miguel Spack Junior, áurea Regina Telles Pupulin
World Journal of AIDS (WJA) , 2013, DOI: 10.4236/wja.2013.34037
Abstract:

Background: Highly Active Antiretroviral Therapy (HAART) has changed the clinical picture of HIV infection by reducing morbidity and mortality rates in the population. However, alterations in lipid metabolism leading to hypertriglyceridemia, hypercholesterolemia, insulin resistance, hyperglycemia and redistribution of body fat, which are risk factors for cardiovascular diseases, have emerged. Metabolic Syndrome (MS) is a complex disorder represented by a set of cardiovascular risk factors commonly associated with central adiposity and insulin resistance. Aim: Current paper evaluates the prevalence of MS in patients with HIV/AIDS using HAART from a reference Center in southern Brazil. Methods: Samples comprised patients who had the infection for at least five years and were undergoing antiretroviral therapy. Metabolic syndrome was identified according to the National Cholesterol Education Program Expert Panel on Detection, Evaluation, and Treatment of High Blood Cholesterol in Adults (NCEP-ATPIII). A physical examination was performed by evaluating percentage of body fat by bio-impedance and measuring blood pressure, determination of Body Mass Index and Waist-Hip Ratio, glycaemia, total cholesterol, HDL cholesterol, LDL cholesterol and triglycerides. Results: 184 patients were evaluated. MS prevalence was 30% (55 patients), with 30 (16.3%) males and 25 (13.7%) females. Conclusions: Brazil was among the first country profoundly impacted by the HIV/AIDS epidemic but today, Brazil has less than 1% adult HIV prevalence, implemented treatment and prevention programs early in the epidemic. Whereas there is currently a significant increase in the survival of HIV patients by HAART, the patients reveal a higher prevalence of Metabolic Syndrome in this specific population requiring political strategy of care to this population.

Oscillation of third order functional differential equations with delay
Tuncay Candan,Rajbir S. Dahiya
Electronic Journal of Differential Equations , 2003,
Abstract: We consider third order functional differential equations with discrete and continuous delay. We then develop several theorems related to the oscillatory behavior of these differential equations.
Free oscillation of the Earth
Y. Abedini
Iranian Journal of Physics Research , 2000,
Abstract: This work is a study of the Earths free oscillations considering a merge of solid and liquid model. At the turn of 19th century Geophysicists presented the theory of the free oscillations for a self-gravitating, isotropic and compressible sphere. Assuming a steel structure for an Earth size sphere, they predicted a period of oscillation of about 1 hour. About 50 years later, the free oscillations of stars was studied by Cowling and others. They classified the oscillation modes of the stars into acoustic and gravity modes on the basis of their driving forces. These are pressure and buoyancy forces respectively. The earliest measurements for the period of the free oscillations of the Earth was made by Benyove from a study of Kamchathca earthquake. Since then, the Geophysicists have been trying to provide a theoretical basis for these measurements. Recently, the theory concerning oscillations of celestial fluids is extended by Sobouti to include the possible oscillations of the Earthlike bodies. Using the same technique, we study the free oscillations of a spherically symmetric, non-rotating and elastic model for the Earth. We used the actual data of the Earths interior structure in our numerical calculations. Numerical results show that there exist three distinct oscillation modes namely acoustic, gravity and toroidal modes. These modes are driven by pressure, buoyancy and shear forces respectively. The shear force is due to the elastic properties of the solid part of the Earth. Our numerical results are consistent with the seismic data recorded from earthquake measurements.
Excitation of Oscillation on Input Filter of Traction Vehicle with Induction Motor
Miroslaw Lewandowski
Advances in Electrical and Electronic Engineering , 2004,
Abstract: The phenomenon of oscillation created on input filter of traction vehicle with induction motor is analyzed here. Instability of the filter may occur especially in case when the receiver is responsible for the filter load and its power is maintained at constant level by fast control loops. The theoretical analysis and simulation studies revealed that the input inverter′s filter oscillations may appear depending on the locatoin of the vehicle in relation to the substation. Asynchronous motor control according to constant power algorithm under specific conditions may be the reason of c.
Economic Evaluation of Continuous Subcutaneous Insulin Infusion for Children with Diabetes—Part II  [PDF]
Elina Petkova, Valentina Petkova, Maia Konstantinova, Guenka Petrova
Modern Economy (ME) , 2013, DOI: 10.4236/me.2013.410A002
Abstract: The aim of this study is to assess long-term metabolic outcomes in children with diabetes mellitus and to compare the efficacy, feasibility and metabolic control expenses for treatment with continuous subcutaneous insulin infusion (CSII), compared to human insulin treatment. The study sample included 34 children aged 3 to 18 years with type 1 diabetes, 17 with continuous subcutaneous insulin infusion (CSII) therapy and 17 with standard treatment with human insulin. The study observed for the following variables: duration of the disease, diabetic control, HbA1c deviation scores; height and weight deviation and price of the treatment. Methods applied include meta-analyses in the published medical literature, pharmacoeconomic analysis and statistical analysis. From the 34 children with diabetes type 1 observed retrospectively during the period 1999-2012, 17 were on CSII (mean age 10 years, mean duration of the disease—7 years, average usage of CSII—3 years). The test stripes cost 533 Euro/year (1100 stripes per year) and their average cost according to the duration of the disease is 3779.45 Euro since diagnosis. The blood glucose monitoring system costs 20 Euro and for the duration of the disease—4.96 Euro per patient per year. The average improvement of HbA(1c) after the CSII introduction is 1.85, while after the application of human insulin—0.28. The treatment with CSII leads to significant improvement in glycemic control compared to the treatment with human insulin. The reduced HbA(1c) shows good diabetes management, from one point of view, and good quality of life—from another.
Prevalence of Hyperuricemia among Hospitalized Elderly Patients and Its Association with Metabolic Syndrome  [PDF]
Tomader Taha Abdel Rahman
Advances in Aging Research (AAR) , 2014, DOI: 10.4236/aar.2014.34043
Abstract: There are few data available on the prevalence of hyperuricemia among elderly and its possible association with metabolic syndrome (MetS) so the aim of this study was to assess prevalence of hyperuricemia among hospitalized elderly patients as well as to assess its association with MetS. Cross sectional data from 200 hospitalized elderly patients were analyzed and the results were as follows: the prevalence of hyperuricemia was 21.0% in elderly men and 15.1% in elderly women. Multivariate logistic regression analysis revealed that BMI ≥ 30 (p = 0.031, OR = 1.1), hypertension (p = 0.019, OR = 1.8), high triglycerides level (p = 0.018, OR = 2.9) and hyperuricemia (p = 0.023, OR = 3.7) were independently associated with MetS. The study concluded that the prevalence of hyperuricemia among hospitalized elderly patients was 21.0% in elderly men and 15.1% in elderly women. There was an independent association between hyperuricemia and metabolic syndrome.
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