Archive of Journal
Volume 72, Issue 5, May. 2016

THE COMBINED EFFECTS OF SUBLETHAL DOSE OF RADIATION AND COAL-ROCK DUST ON PRODUCTS OF LIPID PEROXIDATION IN RATS

Volume 72, May 2016
doi: 10.21506/j.ponte.2016.5.27

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Abstract: The aim of this research is to study the role of free radical oxidation in the tissues of adrenal and immune organs and lymphocytes during combined effect of sublethal dose of gamma radiation (6 Gy) and coal-rock dust in remote period of time. Forty male Wistar rats were divided into four groups: I – control; II – exposure to coal-rock dust; III – exposure to radiation; IV – combined exposure of coal-rock dust and radiation. Rats from group III and IV exposed by radiation up to 90 days with 6 Gy once via Teragam Сo60 (Czech Republic). The analyses of lipid peroxidation indicators after the combined action of gamma radiation and coal-rock dust sublethal doses have been carried out. The combined effect was accompanied by the accumulation of products of diene conjugates and malonic dialdehyde lipids peroxidation in the homogenates. Moreover the development of dual oxidative stress in the investigated objects was observed. The enhanced content of lipid peroxidation products indicates that the increase of free radical processes is due to long term effect. The dominant role of ionizing radiation in combined exposure of coal-radiation factor has been revealed. Keywords: radiation, lipid peroxidation, coal-rock dust, combined action. Forty male Wistar rats were divided into four groups: I – control; II – exposure to coal-rock dust; III – exposure to radiation; IV – combined exposure of coal-rock dust and radiation. Rats from group III and IV exposed by radiation up to 90 days with 6 Gy once via Teragam Сo60 (Czech Republic). The analyses of lipid peroxidation indicators after the combined action of gamma radiation and coal-rock dust sublethal doses have been carried out. The combined effect was accompanied by the accumulation of products of diene conjugates and malonic dialdehyde lipids peroxidation in the homogenates. Moreover the development of dual oxidative stress in the investigated objects was observed. The enhanced content of lipid peroxidation products indicates that the increase of free radical processes is due to long term effect. The dominant role of ionizing radiation in combined exposure of coal-radiation factor has been revealed. Keywords: radiation, lipid peroxidation, coal-rock dust, combined action. Forty male Wistar rats were divided into four groups: I – control; II – exposure to coal-rock dust; III – exposure to radiation; IV – combined exposure of coal-rock dust and radiation. Rats from group III and IV exposed by radiation up to 90 days with 6 Gy once via TERAGAM Сo60 (Czech Republic). The analyses of lipid peroxidation indicators after the combined action of gamma radiation and coal-rock dust sublethal doses have been carried out. The combined effect was accompanied by the accumulation of products of diene conjugates and malonic dialdehyde lipids peroxidation in the homogenates. Moreover the development of dual oxidative stress in the investigated objects was observed. The enhanced content of lipid peroxidation products indicates that the increase of free radical processes is due to long term effect. The dominant role of ionizing radiation in combined exposure of coal-radiation factor has been revealed. Keywords: radiation, lipid peroxidation, coal-rock dust, combined action.

Author(s): Oralbek Ilderbayev, L.E. Chulenbayeva, G.S. Nurmukhambetova, A.K. Musaynova, S.O. Rakhyzhanova, G.O. Ilderbayeva, R.R. Olzhayeva, O.A. Usenova


A Study of the Holistic-Health Status of the Peoples in the Greater Mekong Subregion Countries

Volume 72, May 2016
doi: 10.21506/j.ponte.2016.5.31

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Abstract: Background: Holistic health status is influenced by a multitude of factors, such as socio-economic status, cultural values, perceptions, attitudes, advanced information and technology, and the living and work environment. This study aims to examine the factors that predict the holistic health status of the Thai, Laotian, Vietnamese, and Cambodian peoples in the Greater Mekong Subregion (GMS) countries. Method: One thousand six hundred and seventy participants were recruited from major regions of Thailand, the Lao PDR, Vietnam, and Cambodia, and were selected using multistage random sampling. The study area provinces in each region of the GMS countries were compared according to similar geography and contexts. A self-reported holistic health status questionnaire was developed and a questionnaire assessing the people�s perceptions/attitudes concerning the factors affecting their holistic health was administered. Results: The major finding was that the factors predicting the holistic health of the people were the living and work environment and the availability of medical information and technology at their hospitals. Conclusion: This study initiates policy development in relation to the holistic health status of the people in the GMS countries, especially in terms of its predictors, in order to develop the quality of life of the people living there. The development of international health networks with public and private organizations in the future is recommended. The study of the provincial areas in each region of the GMS countries was compared according to similar geography and contexts.

Author(s): Manyat Ruchiwit

PREDICTION PERFORMANCE OF THE NEW LINEAR CONVEX COMBINATION OF THE BIASED REGRESSION ESTIMATORS

Volume 72, May 2016
doi: 10.21506/j.ponte.2016.5.23

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Abstract: Regression models are widely used in prediction but the predictive performance of the regression models can be adversely affected by multicollinearity. Although biased estimation procedures have been proposed as an alternative to least squares, there has been little analysis of the predictive performance of the resulting equations. Therefore, we discuss the predictive performance of the proposed linear convex combination of the biased regression estimators. Also, the theoretical results are illustrated by a numerical example and the region are established where the proposed estimators are uniformly superior to the other estimators.

Author(s): Issam Dawoud, Selahattin Kaciranlar


LU decompostion of inverse Vandermonde matrix

Volume 72, May 2016
doi: 10.21506/j.ponte.2016.5.29

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Abstract: This paper studies LU decomposition of inverse Vandermonde matrix. This decomposition is stable for inverses of most diagonal matrices. We firstly find a formula to decompose the transpose of this matrix by symmetrical functions and triangular decomposition. Then we propose a formula for inverse Vandermonde matrix, which is applied in many convergence analysis methods such as minimization, e.g. conjugated gradient method or minimum residual methods.

Author(s): maryam zeynali, -


RELATIONSHIP BETWEEN POWERBASES USED BY SCHOOL ADMINISTRATORS AND TEACHERS’ ORGANISATIONAL CYNICISM BEHAVIOURS

Volume 72, May 2016
doi: 10.21506/j.ponte.2016.5.28

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Abstract: This study aims to determine the relationship between bases of power used by school administrators and teachers’ organisational cynicism behaviours. Designed using the survey model, participants of this study are 302 teachers in the Menteşe district of Muğla province in Turkey within the 2013-2014 academic year. Data was collected using the Bases of Power Used by School Administrators Scale, and the Organisational Cynicism Scale. Data was analysed using descriptive statistics, t-test, ANOVA, and multiple regression analysis. The findings indicate that school administrators mostly use their power of expertise in management. Teachers develop a medium level of behavioural cynicism at school. No significant difference was found between cynicism dimensions in terms of gender. Nonetheless, there was found significant difference among teachers’ opinions regarding the reward dimension of the powerbases used by school administrators. Additionally, significant differences were determined both at power dimensions and at cynicism dimensions from the perspective of school type and seniority. Power resources used by school administrators explain approximately 11% of teachers’ cognitive cynicism variance. Analysis conducted to determine significance of regression coefficients showed that legitimate power of school administrator predicted cognitive cynicism scores of the teachers.

Author(s): Vural Hosgorur

STABILITY OF MULTILAYERED COMPOSITE PLATES

Volume 72, May 2016
doi: 10.21506/j.ponte.2016.5.21

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Abstract: The problems of stability of a multilayered plate consisted of an even number of reinforced fibers of composite (anisotropic) layers of identical thickness and identical by elastic properties, is considered. The problem of the plate stability was solved by a static method. For the separation of variables in the equation of the bent surface both collateral rigidities of the plate were set equal to zero. The stability of the plate, consisted of four and six layers, from the applied to the borders critical loads and from the angles between the layers fibers is researched.

Author(s): Mohammad Daryadar

VESICOVAGINAL FISTULA; NEW TRENDS AND MANAGEMENT. AN EXPERIENCE OF 25 CASES IN GYNAE B UNIT OF AYUB TEACHING HOSPITAL ABBOTTABAD

Volume 72, May 2016
doi: 10.21506/j.ponte.2016.5.25

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Abstract: Introduction: Vesicovaginal Fistula (VVF) is a planetary health care problem in which there is abnormal communication between urinary bladder and vagina leading to true incontinence. It creates health care and social problems for the patients due to distressing symptoms of continuous urinary leakage and recurrent infections of urinary track. VVF has also remained a challenge the Surgeon regarding success of its repair. Objective: This study was performed to determine the change in the etiological trends of VVF, management and success of its management. Materials and Methods: This study was conducted during a period of 5 years from January 2011 to December 2015 in Gynae & ObsB Unit of Ayub Teaching Hospital. A total of 25 patients presented with VVF. Etiology of VVF was determined by retrospectively seeing into history of the patient. After complete evaluation of the patient with detailed history examination and investigations, repair surgery was performed. Outcomes of repair were evaluated over next three months. Results: Out of these 25 cases 12(48%) were due to Obstetrical trauma, 10(40%) cases after obstructed labour2(8%) cases after VBAC with scar dehiscence and bladder damage. 4(16%) cases developed after caesarean section in which 2(8%) cases had placenta percreta involving the bladder. 7(28%) cases occurred iatrogenically after total abdominal hysterectomy for gynae problems. 1(4%) case presented with repeated VVF due to bladder stone. 1( 4%) case ended in failure in which there was a compound fistula involving the bladder and ureter. Conclusions: VVF is common obstetrical complication in our part of the country as in other developing countries. The rate of VVF due to iatrogenic cause is also on a rise as time is passing by, with the increase in surgical treatment of gynaecological problems.

Author(s): Ruqqia Sultana, Sundas Nawaz, Naseema Usman, Humaira Bibi, Umair Ijaz


Application of Scaled Extended Conjugate Gradient Method in Solving Continuous-Time Linear Regulator Problems

Volume 72, May 2016
doi: 10.21506/j.ponte.2016.5.30

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Abstract: This paper is aimed at discussing the use of the scaling matrix on the introduction of the associated control operator, G, in an Extended Conjugate Gradient Method (ECGM) to be employed in solving Continuous-Time Linear Regulator Problems (CLRP). The control operator takes care of the Mayer, Lagrange and Bolza cost forms of Continuous-Time Linear Regulator Problems. It is the desire of the authors of this paper that, after the associated control operator, G, must have been introduced to the ECGM and the algorithm scaled, it will further improve the convergence profile of the Extended Conjugate Gradient Method in solving this class of optimal control problems. From the problems tested, numerical results show some improvement over the classical methods.

Author(s): OGUNRINDE ROSELINE BOSEDE, ADEBAYO K. J