Functional and genetic evidence that nucleoside transport is highly conserved in Leishmania species: Implications for pyrimidine-based chemotherapy
Journal ArticleLeishmania pyrimidine salvage is replete with opportunities for therapeutic intervention with enzyme inhibitors or antimetabolites. Their uptake into cells depends upon specific transporters; therefore it is essential to establish whether various Leishmania species possess similar pyrimidine transporters capable of drug uptake. Here, we report a comprehensive characterization of pyrimidine transport in L. major and L. mexicana. In both species, two transporters for uridine/adenosine were detected, one of which also transported uracil and the antimetabolites 5-fluoruracil (5-FU) and 5F,2'deoxyuridine (5F,2'dUrd), and was designated uridine-uracil transporter 1 (UUT1); the other transporter mediated uptake of adenosine, uridine, 5F,2'dUrd and thymidine and was designated Nucleoside Transporter 1 (NT1). To verify the reported L. donovani model of two NT1-like genes encoding uridine/adenosine transporters, and an NT2 gene encoding an inosine transporter, we cloned the corresponding L. major and L. mexicana genes, expressing each in T. brucei. Consistent with the L. donovani reports, the NT1-like genes of either species mediated the adenosine-sensitive uptake of [3H]-uridine but not of [3H]-inosine. Conversely, the NT2-like genes mediated uptake of [3H]-inosine but not [3H]-uridine. Among pyrimidine antimetabolites tested, 5-FU and 5F,2'dUrd were the most effective antileishmanials; resistance to both analogs was induced in L. major and L. mexicana. In each case it was found that the resistant cells had lost the transport capacity for the inducing drug. Metabolomics analysis found that the mechanism of action of 5-FU and 5F-2'dUrd was similar in both Leishmania species, with major changes in deoxynucleotide metabolism. We conclude that the pyrimidine salvage system is highly conserved in Leishmania species - essential information for the development of pyrimidine-based chemotherapy.
Juma Ahmed Mohamed Ali, (08-2017), Netherlands: International journal for parasitology. Drugs and drug resistance, 2 (7), 206-226
الإدارة الإستراتيجية ودورها في رفع أداء الهيئة العامة للشباب والرياضة الليبية
مقال في مجلة علميةـــــــــــــ
عبدالكريم ابراهيم على الطوير، (07-2017)، كلية التربية البدنية جامعة المرقب: مجلة التربية البدنية والعلوم الاخري، 2 (2)، 56-73
Tradeoff in Optimistic Concurrency Control Algorithms for Centralized Database Systems
Journal ArticleOptimistic concurrency control is widely studied in the literature due to the properties of non-blocking and deadlock free execution especially in the domain of real-time systems. In this paper we review the substantial research of optimistic concurrency control protocols. We characterize them into four categories and explore their properties. Then we investigate the general concepts and properties related to Optimistic concurrency control Finally, we demonstrate a comparison table between the varieties of these
protocols.
Tarik Idbeaa, Tariq Khalifa, Kamal M. Solaiman, (07-2017), Univer: University of Bulletin, 19 (3), 59-86
مدى اثقان معلم الرياضيات بالشق الثاني من التعليم الاساسي لكفايات التخطيط للدورة اليومية في ضوء لقياس مقترح
مقال في مجلة علميةتقويم مدى اتقان المعلمين لكفايات التخطيط
المختار علي النوري المبروك، (06-2017)، الناشر دار الزاوية للكتاب: المجلة الليبية للدراسات، 12 (7)، 109-133
Lesion Segmentation in Dermoscopy Images Using Particle Swarm Optimization and Markov Random Field
Conference paperMalignant melanoma is one of the most rapidly increasing cancers globally and it is the most dangerous form of human skin cancer. Dermoscopy is one of the major imaging modalities used in the diagnosis of melanoma. Early detection of melanoma can be helpful and usually curable. Due to the difficulty for dermatologists in the interpretation of dermoscopy images, Computer Aided Diagnosis systems can be very helpful to facilitate the early detection. The automated detection of the lesion borders is one of the most important steps in dermoscopic image analysis. In this paper, we present a fully automated method for melanoma border detection using image processing techniques. The hair and several noises aredetected and removed by applying a bank of directional filters and Image Inpainting method respectively. A hybrid method is developed by combining Particle Swarm Optimization and Markov Random Field methods, in order to delineate the border of the lesion area in the images. The method was tested on a dataset of 200 dermoscopic images, and the experimental results show that our method is superior in terms of the accuracy of drawing the lesion borders compared to alternative methods.
Khalid Ahmad A Eltayef, (06-2017), 2017 IEEE 30th International Symposium on Computer-Based Medical Systems (CBMS): IEEE, 739-744
تعيين مستوى عنصر الرصاص في بعض عينات غداء الرضع المتاحة للاستهلاك في السوق الليبية
مقال في مجلة علمية0
عبدالسلام عبدالله عيسى مكاري، مجدي مصباح السنوسي، (06-2017)، جامعة المرقب: مجلة القلعة، 7 (2017)، 639-651
Hybrid technique for robust image watermarking using discrete time fourier transform
Conference paperThe current paper proposes a novel scheme for non-blind watermarking of images, making use of discrete wavelet transform (DWT), discrete time Fourier transform (DTFT), as well as singular value decomposition, or SVD. During the process of embedding, 1-level DWT is used to decompose the host image into its various frequency sub-bands. After this, the high-frequency sub band receives an application of DTFT. This is followed then by SVD, after which the watermark becomes embedded into the now-transformed host image's singular matrix. Then, the inverses of 1-level DWT, DTFT and SVD are applied in order to obtain a watermarked final image. This paper evaluates the performance of the proposed method of watermarking against a number of attacks, including sharpening, salt and pepper noise, AWGN, gamma correction, histogram equalisation, flipping and cropping. Results obtained during experiments have found that the scheme as proposed does provide high levels of robustness and imperceptibility against various signal processing attacks.
Omar Moftah Ibrahim Abodena, Erbug Celebi, Mary Agoyi, (05-2017), 2017 25th IEEE Signal Processing and Communications Applications Conference: IEEE, 1-4
the management of sustainability
Journal ArticleWith regard to oil production in Libya, the following instruments are particularly important:
- Sustainability guidelines
- Risk analyses
- Eco-efficiency analyses
- Balanced scorecards -
Key sustainability criteria (KPI)
- Certification systems
Sustainability consists of the balance between economic efficiency/economics on the one hand and ecology/environmental compatibility on the other. 15 Sustainable energy systems are always geared to demand. Energy is just one resource among many.
Employees, raw materials, knowledge, etc. are also important resources that need to be managed sustainably and a balance found. A system that is only one-sidedly focused on profit maximization or social compatibility
Mahmod Abdulsalam Mabrouk Ghuader, (05-2017), Munster -Germany: Dr. Frank B. Metzner (Hrsg), 1 (1), 1-25
مقترح لتضمين حقوق الطفل في برامج الاعداد الاكااديمي لخريجي كليات وأقسام علوم التربية البدنية.
مقال في مؤتمر علمي0
هشام القمودي القنطري الحافي، (03-2017)، المؤتمر العلمي الاول كلية التربية تيجي.: تم اخياره،
التطوير المهني لإداء أعضاء هيئة التدريس بجامعة الجبل الغربي بما يتلاءم مع معايير الجودة الشاملة المؤتمر العلمي الأول – بكلية التربية تيج – جامعة الجبل الغربي في الفترة 11-12 – مارس 2017
مقال في مؤتمر علميالمؤتمر العلمي الأول – بكلية التربية تيجي – جامعة الجبل الغربي في الفترة 11-12 – مارس 2017
عبدالعزيز زهمول الضاوي الضبع، (03-2017)، جامعة الجبل الغربي سابقاً: كلية التربية تيجي، 259-286