Cutaneous leishmaniasis (CL) is an endemic parasitic infection in the Mediterranean region, including Libya and 

its Al-jabal Al-gharbi province. We aimed at studying the occupational relevance as well as other epidemiological aspects 

of CL. We investigated 140 CL cases who attended at Gharyan outpatient polyclinic during a period of 6 months in 2009. 

CL infection was clinically diagnosed and confirmed by demonstration of Leishmania parasites on smears from lesions. 

Our findings showed that males were more affected than females (P=0.04), and people above 10-years were more af￾fected than younger ones (P=0.0001). A significant percent of CL cases belonged to Al-Kawasem subprovince 

(P=0.0001). Farm-related activities were the most frequent occupations among CL cases (P=0.04). In addition to farm 

workers, housewives and students are at risk groups since they are engaged at farm activities. Moreover, those who have 

occupations that require staying outdoors for a part of night, e.g., policemen, are also at risk. Compared to children, adult 

CL patients had multiple lesions (P=0.001) that were more prevalent in their upper and lower extremities than the face 

(P=0.0001). We conclude that CL is a major health problem in Al-jabal Al-gharbi province of Libya. The presence of ro￾dents and sandflies makes it a suitable environment for Leishmania to spread in an endemic epidemiological pattern. Be￾ing engaged in farming activities or outdoor occupations increases the risk of infection. Various clinical patterns of CL 

suggest the presence of more than 1 species of Leishmania at Al-jabal Al-gharbi province. We propose that the 2 species 

responsible for CL in this area are L. major and L. tropica. Further investigations to identify the leishmanial species re￾sponsible for CL at Al-jabal Al-gharbi together with adoption of preventive and control programs are needed.

African trypanosomes are capable of both pyrimidine biosynthesis and salvage of preformed pyrimidines from the host. However, uptake of pyrimidines in bloodstream form trypanosomes has not been investigated, making it difficult to judge the relative importance of salvage and synthesis or to design a pyrimidine-based chemotherapy. Detailed characterization of pyrimidine transport activities in bloodstream form Trypanosoma brucei brucei found that these cells express a high-affinity uracil transporter (designated TbU3) that is clearly distinct from the procyclic pyrimidine transporters. This transporter had low affinity for uridine and 2′deoxyuridine and was the sole pyrimidine transporter expressed in these cells. In addition, thymidine was taken up inefficiently through a P1-type nucleoside transporter. Of importance, the anticancer drug 5-fluorouracil was an excellent substrate for TbU3, and several 5-fluoropyrimidine analogs were investigated for uptake and trypanocidal activity; 5F-orotic acid, 5F-2′deoxyuridine displayed activity in the low micromolar range. The metabolism and mode of action of these analogs was determined using metabolomic assessments of T. brucei clonal lines adapted to high levels of these pyrimidine analogs, and of the sensitive parental strains. The analysis showed that 5-fluorouracil is incorporated into a large number of metabolites but likely exerts toxicity through incorporation into RNA. 5F-2′dUrd and 5F-2′dCtd are not incorporated into nucleic acids but act as prodrugs by inhibiting thymidylate synthase as 5F-dUMP. We present the most complete model of pyrimidine salvage in T. brucei to date, supported by genome-wide profiling of the predicted pyrimidine biosynthesis and conversion enzymes.

The aim was to build an educational website to teach preschoolers aged 2-5 years old some skills; related to reading, writing and pronouncing alphabet, numbers, animal names, shapes and other common words. Also, assist parents and teachers by providing digital game-based learning environment to “edutainment” the children. The study illustrated the usability and usefulness of this educational game-based website and provided future insights for researchers and developers to take into account in future work.

one of the challenges recently occurred in the concept of hiding data is the

robustness of hiding data in the way that is difficult to access or detect. Most of the steganography

schemes are based commonly on embed data within images or video frames on their original form

(uncompressed domain).

This paper presents a new methodology for data hiding in MPEG-2 video standard. Data will be

embedding during the compression stage of the AVI-MPEG2 encoding. The BPCS algorithm has

been modified and used in all our experiments for embed data, and the DES (Data Encryption

Standard) algorithm has been used to encrypt data before hiding. It only embeds encrypted data

bits in the quantized AC coefficients (low-frequency AC coefficients) of Y components (Luminance)

for the I-Frame. The obtained results demonstrate that the proposed method has the considerable

advantage over previous steganography schemes with a good PSNR values for the embedded

With the development of the internet and multimedia technology digital video encryption has attracted a great deal of

research interest in the recent few years in applications. In this paper, we propose a method to encrypt video data. The proposed

algorithm is based on the MPEG video coding standard. It selectively encrypts some DCT coefficients in the I frame, B frame and P

frame in MPEG video compression by using chaotic systems. The key in this paper is chaotic sequence based on logistic mapping. It

can produce the pseudo-random sequences with good randomness. The experimental results based on chaotic maps prove the

effectiveness of the proposed method, showing advantages of large key space and high-level security. The proposed algorithm was

measured through a series of tests and achieved good results. The results indicate that the algorithm can be implemented for video

encryption efficiently and it provides considerable levels of security

This paper proposes an estimation method based on the reflection of the (manifest) explanatory variable to estimate the parameters of a simple linear regression model when both response and explanatory variables are subject to measurement error (ME). The reflection method (RM) uses all observed data points, and does not exclude or ignore part of the data or replace them by their ranks. The RM is straightforward, and easy to implement. We show that the RM is equivalent or asymptotically equivalent to the orthogonal regression (OR) method. Simulation studies show that the RM produces estimators that are nearly asymptotically unbiased and efficient under the assumption that the ratio of the error variances equals one. Moreover, it allows to define the sum of squares of errors uniquely, the same way as in the case of no measurement error. Simulation based numerical comparisons of the RM with the ordinary least square (OLS) and OR methods are also included.

The classic problem for a logistically evolving single species population being harvested involves three parameters: rate constant, carrying capacity and harvesting rate, which are taken to be positive constants. However, in real world situations, these parameters may vary with time. This paper considers the situation where these vary on a time scale much longer than that intrinsic to the population evolution itself. Application of a multiple time scale approach gives approximate explicit closed form expressions for the changing population, that compare favorably with those generated from numerical solutions.

Given the pressing need for new antiprotozoal drugs without cross-resistance with current (failing) chemotherapy, we have explored 3-tridecylpyridinium alkaloids (3TPAs), derivatives of viscosamine, as antiparasitic agents. We have developed a simple synthetic route toward viscosamine and related cyclic and linear monomers and oligomers. Evaluation for cytotoxicity on the protozoan parasites Trypanosoma brucei, Leishmania spp., and Plasmodium falciparum revealed several 3TPAs with antiprotozoal activity in the nanomolar range. Their promising selectivity index in vitro prompted us to study the dynamics of cytotoxicity on trypanosomes in more detail. Parasites were killed relatively slowly at therapeutically safe concentrations, in a process that did not target the cell cycle. Clearance of T. brucei cultures was observed at drug concentrations of 1–10 μM.

The higher strength 7xxx aluminum alloys exhibited low resistance to stress corrosion cracking (SCC) when aged to the peak hardness (T6 temper). The overaged alloys (T7 temper) developed to enhance the SCC with loss in the strength of the alloy. Recently, retrogression and re-aging (RRA) heat treatments are used for improving the SCC behavior for alloys in T6 tempers such as 7075, 7475 and 8090. In this study, an application of retrogression and re-aging heat treatment processes are carried out to enhance toughness properties of the 7079-T651 aluminum alloy, while maintaining the higher strength of T651-temper. The results of charpy impact energy and electrical conductivity tests show a significantly increases in absorbed energy and electrical conductivity values, when the alloys are exposed to various retrogression temperatures (190, 200, 210°C) and times (20, 40, 60 minutes), and then re-aged at 160°C for 18 hours.