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Search Results: 1 - 10 of 463169 matches for " Mostafa A. Mousa "
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Air Cooling of Mini-Channel Heat Sink in Electronic Devices  [PDF]
Mousa M. Mohamed, Mostafa A. Abd El-Baky
Journal of Electronics Cooling and Thermal Control (JECTC) , 2013, DOI: 10.4236/jectc.2013.32007
Abstract: Heat transfer experiments were conducted to investigate the thermal performance of air cooling through mini-channel heat sink with various configurations. Two types of channels have been used, one has a rectangular cross section area of 5 × 18 mm2 and the other is triangular with dimension of 5 × 9 mm2. Four channels of each configuration have been etched on copper block of 40 mm width,30 mm height, and 200 mm length. The measurements were performed in steady state with air flow rates of 0.002 - 0.005 m3/s, heating powers of 80 - 200 W and channel base temperatures of 48°C, 51°C, 55°C and 60°C. The results showed that the heat transfer to air stream is increased with increasing both of air mass flow rate and channel base temperature. The rectangular channels have better thermal performance than trian- gular ones at the same conditions. Analytical fin approach of 1-D and 2-D model were used to predict the heat transfer rate and outlet air temperature from channels heat sink. Theoretical results have been compared with experimental data. The predicted values for outlet air temperatures using the two models agree well with a deviation less than ±10%. But for the heat transfer data, the deviation is about +30% to –60% for 1-D model, and –5% to –80% for 2-D model. The global Nusselt number of the present experimental data is empirically correlated as \"\" with accuracy of ±20% for \"\" and compared with other literature correlations.
The effect of maternal thyroxine injection on growth, survival and development of the digestive system of Nile tilapia, Oreochromis niloticus, larvae  [PDF]
Noha A. Khalil, Hassan M. M. Khalaf Allah, Mostafa A. Mousa
Advances in Bioscience and Biotechnology (ABB) , 2011, DOI: 10.4236/abb.2011.25047
Abstract: The present study deals with the effect of exogenous treatment of O. niloticus females with L-thyroxine (T4) on the development of the digestive system during larval rearing, and its subsequent effect on larval growth and survival. The development of the digestive tract and accessory glands was investigated histologically and histochemically in the developing O. niloticus larvae, from control and T4-treated spawners. During yolk-sac absorption, the digestive system of the fish underwent further differentiation and the rudimentary alimentary canal became segmented into four different histological regions: the buccopharynx, oesophagus, stomach and intestine. The injection of females O. niloticus with thyroxine (1 or 10 μg T4/g BW) greatly enhanced the development of the digestive tract and accessory glands of larvae as indicated by the quantitative and qualitative changes of the mucus composition from predominantly neutral to a mixture of neutral and acid mucosubstances, or acid mucosubstances occurred during the rearing period for the larvae produced from T4-treated females. This may be due to the direct effect of exogenous thyroxine, which might have been transferred from maternal circulation into the oocytes and larvae, on the synthesis of proteins, which increased with larval development. Thus, thyroxine directly or indirectly improved O. niloticus larval growth, since a marked increase in both, length and weight of larvae occurred during the experimental period. In addition, larvae from treated females also gave a significantly higher survival rate than that of control. It could be concluded that exogenous T4 in maternal circulation might have been transferred into oocytes and larvae. The transferred thyroid hormone appears to play some role in the early development of larvae and may confer a distinct advantage for the growth of the offspring of the Nile tilapia, O. niloticus.
Immunocytochemical identification and distribution of the cell types in the pituitary gland of Bagrus bayad (Teleostei, Bagridae)  [PDF]
Mostafa A. Mousa, Noha A. Khalil, Amal M. Amal M. Hashem
World Journal of Neuroscience (WJNS) , 2012, DOI: 10.4236/wjns.2012.21004
Abstract: Immunocytochemical identification of the different cell types in the pituitary gland of Bagrus bayad was performed using antisera against mammalian (human and rat) and piscine hormones. The adenohypophysis was composed of rostral pars distalis (RPD), proximal pars distalis (PPD) and pars intermedia (PI). Prolactin and adrenocorticotrophic cells were located in the rostral pars distalis of the pituitary. Gonadotrophic and growth hormone cells were distributed in the proximal pars distalis, but gonadotrophic cells appear also at the border of the pars intermedia. Somatolactin cells, as well as alpha-melanotrophic cells were located in the pars intermedia of B. bayad pitui-tary. The prolactin (PRL) cells were distributed in the RPD stained with orange G and showed strong immunoreactivity with antiserum to chum salmon. The adrenocorticotrophic (ACTH) cells were lead hema-toxylin-positive (PbH+) and showed strong im- mu-noreactivity with anti-human ACTH; these cells bor-dered the neurohypophysis and grouped in islets be-tween PRL cells in the RPD. Growth hormone (GH) cells were densely distributed with the gonadotrophic (GTH) cells in the PPD. They were orange G positive and reacted with antiserum to chum salmon. GTH cells were located in the central area of the PPD and in the external border of the PI. These cells were Alcyan Blue and PAS positive, and immunostained with anti-chum salmon GTH Iβ and anti-chum salmon GTH IIβ. In addition, antiserum to rat thyrotropin stimulating hormone β (TSHβ) reacted positively to the GTH cells. These results suggest that GTH I, GTH II and TSH are synthesized in the same cells in the pituitary of B. bayad. The PI was composed mainly of PbH+ cells and a PAS+ cell adjacent to the neurohypophysis. The PAS+ cells from the PI bound specifically to anti-chum somatolactin. Anti-alpha- melanin stimulating hormone (MSH) stained only the PbH+ (alpha-melanotrophic) cells of the PI.
Hormonal, follicular and endometrial dynamics in letrozole-treated versus natural cycles in patients undergoing controlled ovarian stimulation
Mohamed A Bedaiwy, Mahmoud A Abdelaleem, Mostafa Hussein, Noha Mousa, Lisa N Brunengraber, Robert F Casper
Reproductive Biology and Endocrinology , 2011, DOI: 10.1186/1477-7827-9-83
Abstract: For over 40 years, the first-line therapy for ovulation induction (OI) has been clomiphene citrate (CC) [1]. Its inherent properties such as low price, oral route of administration and high ovulation success rate (60-90%) make it an attractive therapy. However, the pregnancy rate is [2] disappointing. Sub-optimal pregnancy rates with CC have been attributed to peripheral anti-estrogenic effects, mainly on the endometrium and the cervical mucus[3] Gonadotropins are more effective in ovulation induction and are associated with higher pregnancy rates than CC, but are expensive and carry higher risk for ovarian hyperstimulation syndrome and multiple gestations [4].Newer options for ovulation induction are the third-generation aromatase inhibitors (AIs), the most commonly used being letrozole. Initially introduced to treat postmenopausal breast cancer, AIs are now also being used for ovulation induction or enhancement. A recent meta-analysis addressing the use of letrozole in assisted conception concluded that letrozole is as effective as other methods of ovulation induction [5]. When letrozole is used in combination with gonadotropins, it leads to lower gonadotropin requirements and pregnancy rates similar to gonadotropin treatment alone [6]. In a study comparing combined therapy of letrozole (2.5 mg/day or 5.0 mg/day) and recombinant FSH with recombinant FSH alone in an intrauterine insemination (IUI) program, 5 mg/day of letrozole was more cost-effective than the 2.5 mg/day in co-treatment with no adverse effect on pregnancy rate or outcome [7].Aromatase inhibitors for ovulation induction are orally administered, and are relatively inexpensive with minor side effects such as very infrequent headaches and leg cramps[8]. Aromatase inhibitors increase endogenous FSH production in response to decreased estrogen biosynthesis in the ovary and extraovarian tissues, including the brain [9]. Because they do not deplete estrogen receptors like CC, normal central feedback mechan
Some Observations on Microsyntactic Units and Discourse Grammar of Kam  [PDF]
Mousa A. Btoosh
Open Journal of Modern Linguistics (OJML) , 2018, DOI: 10.4236/ojml.2018.84012
Abstract: This study aims to shed light on the microsyntactic units and discourse grammar of Kam, a language spoken in Guizhou, Hunan and Guangxi Provinces in China. To this end, the paper explores the use and functions of particles and classifiers, and how the discourse grammar elements operate across sentences to create texture, cohesion and convey the sender’s communicative intent. The corpus of this study consists of two short stories in addition to some other illustrative examples. Findings show that particles in Kam are used to mark unity and serve pragmatic presuppositions and assertions. Results also indicate that Kam, which features neither wh-movement nor subject-verb inversion in questions, uses particles to express interrogation, aspect and modality. Additionally, the findings reveal that nominal classifiers have less semantic limitations than the verbal ones. Finally, it has been observed that predicates don’t require the phonological appearance of their subjects as long as they are understood contextually.
Immunohistochemical Localization of Gonadotropin-Releasing Hormone and Somatolactin During Sexual Maturation and Spawning of Lates niloticus
Noha A. Khalil,Abd El-Hakim E. El-Gamal,Sohair A. Gaber,Mostafa A. Mousa
Journal of Biological Sciences , 2007,
Abstract: The present study investigated the concomitant changes of mGnRH and SL immunoreactivities within the brain and the pituitary gland at different stages of the gonadal cycle of Lates niloticus. mGnRH cell bodies were observed in the mediobasal hypothalamus within the Nucleus Lateralis Tuberis Pars posterior (NLTP). Cells with immunoreactivity for SL were detected in the Pars Intermedia (PI) of the pituitary gland. The synthetic and secretory activity of both mGnRH-ir neurons and SL-IR cells were increased during sexual maturation and spawning. Both mGnRH-ir neurons and SL-ir cells were small with moderate immunoreactivity in immature fish. However, the synthetic activity of these cells was increased as indicated by the increased numbers and sizes of cells with more immunoreactivity during gonadal development. In late stages of maturation (prespawning), the synthetic activity of mGnRH-ir neurons and SL-ir cells reached their maximum in ripe fish. Finally, during spawning, mGnRH-ir neurons and SL cells showed an increase in the secretory activity in spent fish as reflected by their small sizes, vacuolated appearance and weak immunoreactivity. Furthermore, mGnRH-ir fibers, which are in close association with SL-ir cells, showed similar seasonal changes in the density and immunoreactivity as for mGnRH-ir neurons and SL cells. The dominance of mGnRH in the hypothalamus and its close contact with SL-ir cells in the pituitary gland, together with the concurrent changes of GnRH and SL immunoreactivity in relation to seasonal changes in the reproductive conditions suggest that mGnRH plays an important role for SL release to regulate some biological events related to the reproduction in L. niloticus.
The Predictive Value of Biopsy of the Pancreas and Its Therapeutic Impact in Autoimmune Diabetes  [PDF]
Wael Nassar, Mostafa A. Mostafa
Journal of Diabetes Mellitus (JDM) , 2014, DOI: 10.4236/jdm.2014.44041
Abstract: Diabetes Mellitus is by definition an end-stage organ failure. Type 1 diabetes mellitus (T1DM) is an autoimmune disease. Auto-inflammatory infiltrate appears to characterize the insulitis associated with T2DM. Recently, in 2013, Eva Corpos and colleagues described a comprehensive composition of peri-islet capsules and their basement membrane (BM). Virtanen I, Otonkoski T and Irving-Rodgers H.F. have reported similar descriptions few years earlier which have not been taken seriously as they deserve. Bluestone JA, Virtanen I and Irving-Rodgers H.F. and other colleagues reported that accumulation of the lymphocytes around the islets without invasion of the BM is the first step in disease induction (non-destructive insulitis phase). Invasion of the BM byleucocytic infiltration (destructive insulitis phase) occurs over a period of several years offering a good window for therapeutic intervention. Clinical symptoms appear only when 70% - 90% of β-cell mass are destroyed. This data emphasize the importance of identification and classification of such pathologic features by performing a biopsy of the pancreas with histoimmunochemistry analysis at the pre-hyperglycemic stage in a high risk genetically predisposed autoimmune suspected patient which may at least in part help to achieve new therapeutic approaches and help in halting the progression to end stage pancreatic disease (ESPD) known as diabetes mellitus. In this review we are going to emphasize the predictive role biopsy of the pancreas can build up a solid gold standard tool in diagnosis, stage and therapeutically follow up autoimmune diabetes mellitus.
Electromagnetic Radiation Measurements and Safety Issues of some Cellular
A. Mousa
Journal of Engineering Science and Technology Review , 2011,
Abstract: As the mobile telecommunication systems are tremendously growing allover the world then the numbers of handheld andbase stations are also rapidly growing and it became very popular to see these base stations distributed everywhere in theneighborhood and on roof tops which has caused a considerable amount of panic to the public in Palestine concerning witherthe radiated electromagnetic field from these base stations may cause any health effect or hazard. This paper focuses on theradiated electromagnetic energy from some typical mobile base stations around the city of Nablus. The exposure levels dueto these stations were measured and compared to some international standard guidelines like ICNIRP and FCC to see if itmeets these standards, this is in order to answer some of the public fear and concern. The results are presented and somecomments are made on the other sources of electromagnetic radiation in the 200 kHz to 3 GHz range.
A Hybrid Optimization Technique Coupling an Evolutionary and a Local Search Algorithm for Economic Emission Load Dispatch Problem  [PDF]
A. A. Mousa, Kotb A. Kotb
Applied Mathematics (AM) , 2011, DOI: 10.4236/am.2011.27119
Abstract: This paper presents an optimization technique coupling two optimization techniques for solving Economic Emission Load Dispatch Optimization Problem EELD. The proposed approach integrates the merits of both genetic algorithm (GA) and local search (LS), where it maintains a finite-sized archive of non-dominated solutions which gets iteratively updated in the presence of new solutions based on the concept of ε-dominance. To improve the solution quality, local search technique was applied as neighborhood search engine, where it intends to explore the less-crowded area in the current archive to possibly obtain more non-dominated solutions. TOPSIS technique can incorporate relative weights of criterion importance, which has been implemented to identify best compromise solution, which will satisfy the different goals to some extent. Several optimization runs of the proposed approach are carried out on the standard IEEE 30-bus 6-genrator test system. The comparison demonstrates the superiority of the proposed approach and confirms its potential to solve the multiobjective EELD problem.
Enhanced Particle Swarm Optimization Based Local Search for Reactive Power Compensation Problem  [PDF]
Abd Allah A. Mousa, Mohamed A. El-Shorbagy
Applied Mathematics (AM) , 2012, DOI: 10.4236/am.2012.330184
Abstract: This paper presents an enhanced Particle Swarm Optimization (PSO) algorithm applied to the reactive power compensation (RPC) problem. It is based on the combination of Genetic Algorithm (GA) and PSO. Our approach integrates the merits of both genetic algorithms (GAs) and particle swarm optimization (PSO) and it has two characteristic features. Firstly, the algorithm is initialized by a set of a random particle which traveling through the search space, during this travel an evolution of these particles is performed by a hybrid PSO with GA to get approximate no dominated solution. Secondly, to improve the solution quality, dynamic version of pattern search technique is implemented as neighborhood search engine where it intends to explore the less-crowded area in the current archive to possibly obtain more nondominated solutions. The proposed approach is carried out on the standard IEEE 30-bus 6-generator test system. The results demonstrate the capabilities of the proposed approach to generate true and well-distributed Pareto optimal nondominated solutions of the multiobjective RPC.
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