Academic Research Publishing Agency Press
International Journal of Research and Reviews in Applied Sciences
ISSN: 2076-734X, EISSN: 2076-7366

Volume 19, Issue 2(May, 2014)

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1. EFFECT OF HIGH PRESSURE ON LONG-TERM POTENTIATION IN RAT HIPPOCAMPAL CA1 REGION: AN ELECTOPHYSIOLOGICAL STUDY
by Chaymae El Alaoui, Taher Hazaz, Fouad Berrada, Fatiha Zinebi, Jean-Claude Rostain, Heinrich Brinkmeier, Mustapha Lkhider & Taoufiq Fechtali
Abstract

Pressures above 15 bar induce in mammals and humans the high pressure neurological syndrome (HPNS). This syndrome is characterized by various neurological disorders and motor decremented associated with memory disorders. However, a brief tetanic stimulation of an excitatory pathway in the hippocampus, synaptic transmission through the tetanized pathway is facilitated for a long period. This phenomenon is called long-term potentiation (LTP), and has been regarded as a neuronal correlate with learning and memory. Human and animal studies have shown that motor learning results in long-term potentiation (LTP)-like plasticity processes. Thus, it has been speculated that the occlusion of LTP-like plasticity after learning, indicative of how much LTP was used to learn, is essential for retention.  In order to understand the pressure-induced alteration in memory processes, we aim to study the effect of high pressure on long term potentiation in rat hippocampal slide. The effect of high pressure on LTP was studied in vitro in CA1 region of hippocampal slices using electrophysiological recordings. Our results show that pressures above 50 bar inhibit the development of LTP. Pressure-induced disorders in glutamatergic transmission have been reported.  Our findings suggest that the effect of pressure on LTP in CA1 could be related to the reduction of glutamatergic activity and/or a significant depolarization of CA1 that may involve voltage-dependent calcium channels.

Source: International Journal of Research and Reviews in Applied Sciences
May 2014-- Vol. 19 Issue 2 -- 2014

2. CHROMATOGRAPHIC SEPARATION AND IDENTIFICATION OF MANY FATTY ACIDS FROM FLOWERS OF HIBISCUS SABDARIFFA L. AND ITS INHIBITORY EFFECT ON SOME PATHOGENIC BACTERIA

by Fatimah I. Sultan, Ayad C. Khorsheed & Abdul-Razzak K. Mahmood

Abstract

ABSTRACT

Gas-liquid chromatography (GLC) method was used for the qualitative and quantitative analysis of seven fatty acid compounds in the petroleum ether, chloroform and fractions (Chloroform-Ethanol) from (Aceton, Ethanol and also aqueous extract after using column chromatography of the crude extracts of Hibiscus sabdariffa flowers. Fatty acids were investigated as followings: Lauric, Palmitic, Linoleic, Stearic, Oleic, Heptanoic and Octanoic acids. The major component of fatty acids content was palmitic and Linoleic acids, respectively while the other fatty acids were identified in a trace amounts. All extracts under study were tested against some pathogenic bacterial of human, the grame positive were (Corynebacterium diphtheria, staphylococcus aureus, staphylococcus capitis), and the gram negative were (Pseudomonas aurogenosa and protus merabeles) from the all extracts, the fraction of (Chloroform-Ethanol) (H3F1) gave the highest effect as a result of containing of all the fatty acids except Heptanic acid, and it gave inhibition range: (26-34 mm) which was comparisons with authentic samples at concentration of Gentamicin (CN) (10 mcg/disc), Amikacin (AK) (10 mcg/disc), Tobramycin (TOB) (10 mcg/disc). As the effect of fatty acid extracts of Rosella flowers exceeded selected antibiotics under study. The combination of these fatty acids in H3F1 extract showed higher synergistic bactericidal effect against all bacteria under study.
Source: International Journal of Research and Reviews in Applied Sciences 
May 2014-- Vol. 19 Issue 2 -- 2014

3. MODIFICATIONS ON RSA CRYPTOSYSTEM USING GENETIC OPTIMIZATION
by Abdel-karim S.O. Hassan, Ahmed F. Shalash & Naglaa F. Saudy
Abstract

This paper proposes a modified approach to data security using the concept of genetic algorithm and RSA cryptography to encrypt and decrypt the data. Genetic algorithms are a class of optimization algorithms which can be used to solve many problems through modeling a simplified version of genetic processes. Using Genetic Algorithm we can keep the strength of the key to be good, still make the whole algorithm good enough. We introduce a modified ciphering technique that lead to a modified ciphering system that can be used in encrypting data. This system is combination of symmetrical system using Genetic algorithm Inspired Cryptography and asymmetrical system using RSA cryptography to make the key very complex to reinforce resistance to cryptanalysis. The first operation is asymmetrical using genetic optimization to generate the key. The second operation of the modified ciphering technique is by using RSA algorithm. The key produced is non-repeating and thus making the cipher almost difficult to break. The feature of such an approach includes high data security and high feasibility for practical implementation.

Source: International Journal of Research and Reviews in Applied Sciences
May 2014-- Vol. 19 Issue 2 -- 2014

4. ACID RAIN DEPOSITION IN SELECTED PARTS OF SOUTH-EASTERN AND SOUTH-SOUTHERN NIGERIA
by Ifeanyi F. Offor, Frank I. Nwabue & Omaka N. Omaka
Abstract

Acid rain is a secondary effect of air pollution which has been causing industrialized nations of Europe and America great concern. Acid rain phenomenon is however becoming prevalent in Southern Nigeria as a result of industrial activities including oil drilling operations going on in the Niger Delta. Existence of acid rain in South-Eastern and South-Southern Nigeria was investigated by collecting representative samples of rain water and dry deposition from Nsukka, Egbema and Port-Harcourt towns on a weekly basis for 2 months (July-August) in 2009.The samples were tested for physico-chemical parameters according to the standard methods of water analysis and the range of results obtained were: pH(6.3-7.4), specific conductivity(0.36-1.40µS/Cm), suspended matter (0.063-0.23mg/l), SO42- (0.36-1.10mg/l), NO3- (0.53-1.97mg/l), NH4+ (0.074-0.13mg/l), Cl- (0.54-0.79mg/l), Ca2+ (0.50-2.75mg/l), Mg2+ (0.30-0.80mg/l), Na+ (0.10-4.05mg/l), K+ (0.32-0.73mg/l), Fe2+ (0.05-0.51mg/l) and Pb2+ (0.015-0.18mg/l). The mean average rainfall was highest in Egbema area (22.52-23.05mm) and lowest in Nsukka area (5.98-8.67mm) between the periods investigated (July to August). Cation and anion levels in rain samples were lower than the World Health Organization (WHO) international standards for drinking water (except for Pb2+ and NH4+). Dry deposition in samples varied from 0.00mg/l of Pb in down UNN area to 9.40mg/l of Na+  in Egbema area. One-Way Repeat measures ANOVA analysis showed no significant difference between amout of rainfall and other physiochemical parameters in all sampling locations investigated. Petroleum exploration in South-Southern Nigeria and growing number of cottage industries in South-Eastern Nigeria impacted on the inorganic ion pollution of rain water in these regions which may have possible health implications.

Source: International Journal of Research and Reviews in Applied Sciences
May 2014-- Vol. 19 Issue 2 -- 2014

5. POWERS OF COMPLEX PERSYMMETRIC ANTI-TRIDIAGONAL MATRICES WITH CONSTANT ANTI-DIAGONALS
by Wang Yusun, Qin Mei, Wang Haibo & Pan Xue
Abstract

In this paper, we derive a general expression for the pth power (p ϵ N) of any complex persymmetric anti-tridiagonal Hankel( constant anti-diagonals) matrices, in terms of the Chebyshev polynomials of second kind. Numerical examples are presented, which show that our results generalize the results in [4],[5],[7].

Source: International Journal of Research and Reviews in Applied Sciences
May 2014-- Vol. 19 Issue 2 -- 2014

6. A MODIFIED REGULARIZED NEWTON METHOD FOR UNCONSTRAINED NONCONVEX OPTIMIZATION
by Heng Wang, Mei Qin & Haibo Wang
Abstract

In this paper, we present a modified regularized Newton method for the unconstrained nonconvex optimization by using trust region technique. We show that if the gradient and Hessian of the objective function are Lipschitz continuous, then the modified regularized Newton method (M-RNM) has a global convergence property. Numerical results show that the algorithm is very efficient.    

Source: International Journal of Research and Reviews in Applied Sciences
May 2014-- Vol. 19 Issue 2 -- 2014