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Articles by M. A. Mohamed
Total Records ( 3 ) for M. A. Mohamed
  Naglaa Fathy Al Husseini , Mosaad M. Odaa , M. A. Mohamed , Wlaa B. Abd El Wahab and Amr A. Hasan
  Problem statement: Similar to obese patients and type 2 diabetic patients, adiponectin levels are reduced in former Gestational Diabetes Mellitus (GDM) patients and are lower in GDM women during late pregnancy compared with pregnant control subjects matched for BMI. Diabetic insult at later stages in gestation, such as may occur in gestational diabetes, will foremost lead to short-term changes in a variety of molecules for key functions including gene expression in the placenta. Approach: In this study we assessed the expression of adiponectin receptors in human placenta to identify the site (s) of expression and to clarify the effect of gestational diabetes in this expression. This study was carried on 10 normoglycemic pregnant women and 20 GDM women. The placental tissue was collected immediately after delivery and tissue biopsies were taken from both fetal and maternal sides of each placenta. One step-RT-PCR for ADIPOR1 and ADIPOR2 was done by Real Time PCR using Syber Green technique. Relative quantification of mRNA of the ADIPOR1 and ADIPOR2 genes was measured using ABI7900 Real Time machine. Results: Both types of Adiponectin Receptors (ADIPOR1 and ADIPOR2) are expressed in human placenta. ADIPOR1 is more highly expressed than ADIPOR2 in both fetal and maternal sides of GDM cases and normal pregnant women. ADIPOR1 mRNA expression was significantly up regulated in GDM women compared to normal pregnant women, whereas no significant difference in the expression of ADIPOR2 was detected between the two groups. There was no evidence of maternal-fetal side difference in the expression of adiponectin receptors in GDM cases but in normal pregnant women there is a statistically significant difference between both sides in the expression of both ADIPOR1 and ADIPOR2. Conclusion: We concluded that adiponectin plays an important role in mediation the glucose metabolism in fetal tissues through its receptors, mainly Adiponectin Receptor 1 (ADIPOR1).
  H. M.A. Hassan , Amani W. Youssef , H. M. Ali and M. A. Mohamed
  A growth experiment was conducted to study performance, nutrients digestibility and economic efficiency of broiler chicks fed corn-soybean meal diets supplemented with a commercial phytogenic product (Bedgen 40®) contained artichoke extract (Cynara scolymus), a commercial mixture of organic acids (Galliacid®) and a combination of both. Starter, grower and finisher diets were supplemented with two levels of both being 0 and 150 g t-1 artichoke extract and 0 and 600 g t-1 organic acids in 2x2 factorial arrangement. Dietary treatments were examined on 200 one day-old Cobb broiler chicks. The experiment lasted from 1-39 days of age. The results showed that supplementation of artichoke extract or organic acids mixture significantly (p<0.05) increased body weight gain by about 6% and improved feed conversion ratio by about 7%, compared with the control diet of no feed additives. Addition of artichoke extract improved the digestibility coefficients (p<0.01) of CP and CF, while, addition of organic acids mixture improved the digestibility coefficients (p<0.01) of DM, OM, CP, CF and NFE compared to the un-supplemented diet. Supplementation of artichoke extract and organic acids decreased total feed cost/kg body weight and improved net profit and economic efficiency. It could be concluded that using artichoke extract or organic acids mixture improved broiler performance and economic efficiency of broilers fed corn-soybean meal diets. No associative effect was detected on performance, digestibility or economic efficiency when a combination of both products was used.
  M. A. Mohamed , M. R.M. Said , K. A.M. Atan and Z. Ahmad Zulkarnain
  Problem statement: Until recently, many addition chain techniques constructed to support scalar multiplication operation have been proposed tailored to limited computational resources. In securing the efficiency of ECC point operation, the combinations of the two basic operations, point addition and doubling are mostly implemented. Using binary method, the operation of doubling depends solely on the length of binary representation itself, so the most probable way to reduce the total number of the whole operation is by reducing the number of addition operation. This limitation is quite problematic. Approach: In this study we proposed an improved binary method which reads input block by block basis. Instead of having to add one to current chain every time non zero digit appears, this method requires one addition for every non zero block. A mapping table is used to store all possible binary string and its decimal version. For every block, its decimal value is extracted from the table and this value will be added to the current chain. In return, it requires precomputations for all possible combination of input blocks. Results: The new method showed a significant reduction in the number of required additions and the magnitude of improvement varies according to the key size. Conclusion: The algorithm is suitable to be adapted into cryptographic system especially as the need for bigger key size is growing rapidly.
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