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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 |
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by Chaymae El Alaoui, Taher Hazaz, Fouad Berrada, Fatiha Zinebi, Jean-Claude Rostain, Heinrich Brinkmeier, Mustapha Lkhider & Taoufiq Fechtali |
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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.
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Source: |
International Journal of Research and Reviews in Applied Sciences
May 2014-- Vol. 19 Issue 2 -- 2014 |
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2. |
CHROMATOGRAPHIC SEPARATION AND IDENTIFICATION OF MANY FATTY ACIDS FROM FLOWERS OF HIBISCUS SABDARIFFA L. AND ITS INHIBITORY EFFECT ON SOME PATHOGENIC BACTERIA |
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by Fatimah I. Sultan, Ayad C. Khorsheed & Abdul-Razzak K. Mahmood
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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.
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Source: |
International Journal of Research and Reviews in Applied Sciences
May 2014-- Vol. 19 Issue 2 -- 2014 |
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3. |
MODIFICATIONS ON RSA CRYPTOSYSTEM USING GENETIC OPTIMIZATION |
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by Abdel-karim S.O. Hassan, Ahmed F. Shalash & Naglaa F. Saudy |
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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.
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Source: |
International Journal of Research and Reviews in Applied Sciences
May 2014-- Vol. 19 Issue 2 -- 2014 |
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4. |
ACID RAIN DEPOSITION IN SELECTED PARTS OF SOUTH-EASTERN AND SOUTH-SOUTHERN NIGERIA |
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by Ifeanyi F. Offor, Frank I. Nwabue & Omaka N. Omaka |
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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.
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Source: |
International Journal of Research and Reviews in Applied Sciences
May 2014-- Vol. 19 Issue 2 -- 2014 |
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5. |
POWERS OF COMPLEX PERSYMMETRIC ANTI-TRIDIAGONAL MATRICES WITH CONSTANT ANTI-DIAGONALS |
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by Wang Yusun, Qin Mei, Wang Haibo & Pan Xue |
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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].
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Source: |
International Journal of Research and Reviews in Applied Sciences
May 2014-- Vol. 19 Issue 2 -- 2014 |
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6. |
A MODIFIED REGULARIZED NEWTON METHOD FOR UNCONSTRAINED NONCONVEX OPTIMIZATION |
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by Heng Wang, Mei Qin & Haibo Wang |
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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.
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Source: |
International Journal of Research and Reviews in Applied Sciences
May 2014-- Vol. 19 Issue 2 -- 2014 |
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