176 research outputs found
Synergistic effects of GSK3 and p38 MAPK inhibitors on growth of Plasmodium falciparum ex vivo
Pharmacological inhibitors of glycogen synthase kinase 3 (GSK3) and p38 mitogen-activated protein kinase (p38 MAPK),
two kinases commonly associated with signaling within cells, have been shown to suppress in vivo or ex vivo growth of
plasmodial sp. Here we evaluated antiplasmodial activities ex vivo of four inhibitors against GSK3 [lithium chloride (LiCl),kenpaullone, (2’Z, 3’E)-6-bromoindirubin-3’-oxime (BIO) and SB216763]; and two against p38 MAPK (RWJ67657 and
SB202190) individually and in combination preparatory to understanding the role of protein kinases in plasmodial development.The order of decreasing growth-suppressing potencies of the GSK3 inhibitors tested against Plasmodium falciparum 3D7 cultured ex vivo in erythrocytes was BIO (IC50=3.13 μM) > kenpaullone (IC50 = 18.3 μM) > SB216763 (IC50= 27.12 μM)> LiCl (IC50= 25 468 μM). The p38 MAPK inhibitor, RWJ67657, displayed an IC50 of 7.52 μM against 3D7. SB202190 was less effective at inhibiting 3D7 displaying an IC50 of 14.80 μM. When tested in combination, marked synergism was observed for combination of BIO or SB216763 with RWJ67657. In conclusion, GSK3 and MAPK inhibitors showed potent antiplasmodial activities. Synergistic effects observed between BIO or SB216763 and RWJ67657 in inhibiting plasmodial growth may implicate interaction between MAPK and GSK3 pathways and warrant further investigation
Parameter estimation of multicomponent transient signals using deconvolution and arma modelling techniques
Parameter estimation of transient signals, having real decaying exponential constants, is a difficult
but important problem that often arises in many areas of scientific disciplines. The frequency
domain method of analysis that involves Gardner transformation and conventional inverse filtering
often degrades the quality of the deconvolved data, leading to inaccurate results, especially for
noisy data. An improved method that is based on the combination of Gardner transformation,
optimal compensation deconvolution, and signal modelling techniques is suggested in this paper.
In this method of analysis the exponential signal is converted to a convolution model whose input
is a train of weighted delta function that contains the signal parameters to be determined. The
resolution of the estimated decay rates is poor if the conventional fast Fourier transform (FFT)
algorithm is used to analyse the resulting deconvolved data. Using an autoregressive moving
(ARMA) model whose AR parameters are determined by solving high-order Yule–Walker
equations (HOYWE) via the singular value decomposition (SVD) algorithm can alleviate this
shortcoming. The effect of sampling conditions, noise level, number of components and relative
sizes of the signal parameters on the performance of this modified method of analysis is examined
in this paper. Simulation results show that high-resolution estimates of decay constants can be
obtained when the above signal processing techniques are used to analyse multiexponential signals
with varied signal-to-noise ratio (SNR). This approach also provides a graphical procedure for
detecting and validating the number of exponential signals present in the data. Some computer
simulation results are presented to justify the need for this modified method of analysis
Design of intelligent braking system
It is anticipated that a variety of cars with
diversified features that include anti-lock braking system
(ABS), traction control system (TCS), antiskid Steering,
collision warning system (CWS) will be more
commercially produced to satis@ the consumer needs in the
near future. This is parallel to the trend of current
technology of manufhcturing smart cars and the &sires of
people who always want to have comfortable and safe ride
in their vehicles. Mower this type of vehicles can fit
much better into the intelligent highway that Malaysian
government is planning to have in the near future.
Consequently, there is a need to modify the current
conventional braking system so as to make it work
automatically. This paper considers the use of intelligent
controller to achieve the above objective. To ensure high
speed of system response, the DSP controller TMS320C24x
with - fuzzy algorithm is used in the
implementation of this new device. Results of simulation
studies using the MATLAB have demonstrated the
feasibility of this new system under investigation
Design And Implementation of Dsp-Based Intelligent Controller For Automobile Braking System
An intelligent braking system has great potential applications especially, in developed countries where research on smart vehicle and intelligent highways are receiving ample attention. The system when integrated with other subsystems like automatic traction control, intelligent throttle, and auto cruise systems, etc will result in smart vehicle maneuver. The driver at the end of the day will become the passenger, safety accorded the highest priority and the journey optimized in term of time duration, cost, efficiency and comfortability. The impact of such design and development will cater for the need of contemporary society that aspires to a quality drive as well as to accommodate the advancement of technology especially in the area of smart sensors and actuators. The emergence of digital signal processor enhances the capacity and features of universal microcontroller. This paper introduces the use of TI DSP, TMS320LF2407 as an engine of the system. The overall system is designed so that the value of inter-vehicle distance from infrared laser sensor and speed of follower car from speedometer are fed into the DSP for processing, resulting in the DSP issuing commands to the actuator to function appropriately
Performance evaluation of the deconvolution techniques used in analyzing multicomponent transient signals
Deconvolution is an important preprocessing
procedure often needed in the spectral analysis of
transient exponentially decaying signals. Three
deconvolution techniques are studied and applied to the
problem of estimating the parameters of
multiexponential signals observed in noise. Both the
conventional and optimal compensated inverse filtering
approaches produce data which are further analyzed by
SVD-based autoregressive moving average (ARMA)
modeling techniques. The third procedure is based on
homomorphic filtering and it is implemented by fast
Fourier transform (FFT) technique. A comparative
study of the performance of the above deconvolution
techniques in analyzing multicomponent exponential
signals with varied signal-to-noise ratio (SNR) is
examined in this paper. The results of simulation studies
show that the homomorphic deconvolution technique is
most computationally efficient, however, it produces
inaccurate estimates of signal parameters even at high
SNR, especially with closely related exponents.
Simulation results show that the optimal compensation
deconvolution technique is indeed a generalized form of
the conventional inverse filtering and has the potential
of producing accurate estimates of signal parameters
from a substantial wide range of SNR data
Design of intelligent multifinger gripper for a robotic arm using a DSP-based fuzzy controller
The design and modeling of a robotic arm
gripper that has elements of intelligent decision making
while grasping object has been recently discussed. This new
system is different in using an appropriate controlling
scheme so that the correct force is applied to pick an object
without dropping or crushing it. This is achieved by
controlling the shear stresses at the interface material
between finger-ends and the object using smart sensors and
intelligent controller. A new slip sensor that is based on the
operation of optical encoder is used to monitor the slip rate
as a result of insufficient force being applied to pick an
object. A two-stage control scheme is suggested for the
implementation of this system. First a limit switch is used
to control the positioning of the fingers thereby solving the
problem of uncertainty in the location and orientation of the
object. Then, to ensure that an appropriate force is used in
picking up an object a fuzzy logic controller is used. The
use of TMS320C24XX series DSP controller to implement
the control strategy provides the flexibility needed in
altering the control code and the prototype can be tested at
low cost
Quality assessment of ozone-treated citrus fruit juices
The aim of the present work was to analyse the impact of ozone treatment on the physicochemical parameters and antioxidant capacity of citrus fruit juices (orange, lemon and lime) with different juice components (total soluble solids). Each sample was ozonated at different ozone treatment time, between 0 to 30 min with fixed ozone concentration of 600 mg/h. The synergistic effects of ozone treatment and the different types of juice were found to significantly affect the pH, total colour difference (TCD), pectin methylesterase (PME) activity, ascorbic acid (AA) and total phenolic content (TPC) of treated juices, while total soluble solids, turbidity and 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay were found to be unchanged. It was observed that PME activity decreased with treatment time and this is related to the decrease of juice turbidity (R2 = 0.86) and TCD (R2 = 0.78). Ascorbic acid showed an abrupt decrease in all the juices especially in orange juice with percentage loss of 85%. TPC also showed decreasing trend for all juices with maximum loss of 84.4% in lemon juice after 30 min of ozonation time. The present work also found that lemon juice could retain most of its antioxidant activities (DPPH 98.9%, TPC 96%, AA 86.7%) after 10 min of ozone treatment time in comparison to orange and lime juices
Optical and electrical characteristics of (LiCl)x(P2O5)1-x glass.
Homogeneous (LiCl) x (P2O5)1 − x glasses were synthesised using a melt-quenching method for x = 0.1–0.6 in the interval of 0.05. The amorphous structure of the samples was evident by the X-ray diffraction spectrum. The short range structures of the binary phosphate samples were examined by Fourier transform infrared spectroscopy, whilst the density of the samples was measured as supportive data for the investigations. The results of refractive indices as measured using an ellipsometer reveal the homogeneity of samples and was found to depend on the glass composition. The electrical properties of the glasses were investigated by ac impedance spectroscopy from 10 mHz to 1 MHz for temperatures ranging from room temperature to 573 K. An estimation of the bulk resistivity was obtained by taking the intercepts on the real axis at low frequencies of the complex impedance plot. The dc conductivities derived from the reciprocal of resistivity values were found to obey the Arrhenius relationship, and its activation energy shows a decreasing trend with the increase in LiCl content in the glass. Lastly, an equivalent circuits consisting of real and complex capacitors is proposed to describe the dielectric response of the glass
Production of high strength bioliquid from municipal solid waste (MSW) using mixed culture
Landfilling is one of the most commonly used methods of municipal solid waste (MSW) disposal. It is necessary because there are residues in all waste management processes that cannot be reused or recovered further and are essentially landfilled. For the degradation of MSW, thermal, mechanical and biological pretreatment techniques are used. MSW could be treated and converted into liquid biomass (bioliquid) by using enzymes. This research focused on the production of high strength bioliquid in MSW. The experiments were conducted in three stages namely: acclimatization process, preliminary study and factorial analysis to determine the production of high strength bioliquid in MSW. The selected factors were ratio of AMC and substrates (1:2 and 1:5), temperature (room temperature and 37 °C), pH (adjusted pH and no pH adjustment), PET plastics size (1cm2 and 4cm2) and Hydraulic Retention Time (3 hours and 9 hours). Design Expert software (Version 7) was used to construct an experimental table where all the factors were randomized. Two-level factorial analysis (TLFA) was used to analyze the most contributing factor and interaction between the factors. The results showed that the most significant factor was temperature, while the interaction factors were between temperature and HRT. The best conditions of COD increment were determined at AMC/S ratio 1:5, adjusted pH, PET plastics size of 1cm x 1cm, at room temperature and HRT of 3 hours. The experimental and targeted final increments of COD were 2.19 and 1.99 respectively. Since the error was less than 10%, it is acceptable, and the objectives of this research were successfully achieved
Effects of concurrent TeO2 reduction and ZnO addition on elastic and structural properties of (90 − x)TeO2–10Nb2O5–(x)ZnO glass
Niobium-containing tellurite glass with starting composition of (90 − x)TeO2–10Nb2O5–(x)ZnO (x = 0–15 mol%) have been prepared by melt-quenching method and the effect of reduction of TeO2 with simultaneous increase in ZnO on elastic properties was studied. Ultrasonic longitudinal and shear velocity showed initial decrease of 3.52% and 2.37%, respectively, at x = 5 mol%. For x > 5 mol%, longitudinal velocity showed weak recovery but shear velocity showed steady recovery with ZnO and recorded 0.95% increase in value at x = 15 mol% compared to x = 0 sample. Shear and Young's moduli recorded similar drop at x = 5 mol% followed by strong recovery at x > 5 mol%, while longitudinal and Bulk modulus showed weak and no recovery, respectively, with x. Infrared (IR) absorption spectra showed increase in intensity of NbO6-assigned peak accompanied by increase in intensity of ZnO4 tetrahedra and TeO4 trigonal bipyramid (tbp) assigned peaks indicating formation of both non-bridging oxygen, NBO and bridging oxygen, BO, respectively, with addition of ZnO. The initial drop in ultrasonic velocity and related elastic moduli observed at x = 5 mol% indicates weakening of network rigidity of the glass system due to structural modification as a direct effect of TeO2 reduction and existence of NBO. However, further replacement of TeO2 by ZnO at x > 5 mol% contributed to increase in BO causing rigidity of the glass network to improve. In addition, hardness, H, was observed to increase with ZnO indicating increase in connectivity of the glass network while Poisson's ratio, σ, decreased indicating increase in cross-link density of the glass system. The combined results of ultrasonic velocity and IR absorption spectra suggest that the role of TeO2 is very critical in the ternary glass system as, although ZnO addition showed improved rigidity due to recovery of shear modulus, the weakening of longitudinal and Bulk moduli indicates ZnO is not fully effective as glass former in place of TeO2
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