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Osman.B.M, Elkarmalawy.E.M, Sharaa.H.M, and Elzoughby.A.F, "Nurses’ knowledge regarding oral and dental health Nurses’ knowledge regarding oral and dental health", Bioscience Research, vol. 15, issue 4, pp. 2929-2937, 2018. nurses_knowledge_regaring_oral_health_across_life_span.pdf
Osman.B.M, Elkarmalawy.E.M, and ElShaer.E.H, Food Safety: Knowledge, Attitude and Practice among Household Women, , 2014.
Osman.B.M, Sharaa.H.M, and Elkarmalawy.E.M, "ORAL AND DENTAL NURSING CARE KNOWLEDGE AND PRACTICE AMONG NURSES WORKING AT PRIMARY DENTAL CLINIC: A SURVEY STUDY", IMPACT: International Journal of Research in Applied, Natural and Social Sciences (IMPACT: IJRANSS), vol. 6, issue 3, pp. 67-78, 2018. Oral and dental nursing care knowledge and practice among nurses.pdf
Osman1, K. M., A. K. A. El-Razik2, H. S. H. Marie2, and A. Arafa2, "Relevance of biofilm formation and virulence of different species of coagulase-negative staphylococci to public health", Eur J Clin Microbiol Infect Dis, vol. 34(7), issue ISSN 0934-9723, pp. 1-8, 2015.
OSMAN1, K. A. M. E. L. I. A. M., Z. M. S. Amin, M. A. K. Aly, H. Hassan, and W. S. Soliman, "SDS-PAGE Heat-Shock Protein Profiles of Environmental Aeromonas Strains ", Polish Journal of Microbiology 2011, vol. Vol. 60, No 2, pp. 149–154, 2011.
Ossama, O., H. M. O. Mokhtar, and M. E. El-Sharkawi, "Clustering Moving Objects Using Segments Slopes", International Journal of Database Management Systems, vol. 3, issue 1, 2011. AbstractCu_pdf.pdf

Given a set of moving object trajectories, we show how to cluster them using k-means
clustering approach. Our proposed clustering algorithm is competitive with the k-means clustering
because it specifies the value of “k” based on the segment’s slope of the moving object trajectories. The
advantage of this approach is that it overcomes the known drawbacks of the k-means algorithm, namely,
the dependence on the number of clusters (k), and the dependence on the initial choice of the clusters’
centroids, and it uses segment’s slope as a heuristic to determine the different number of clusters for the
k-means algorithm. In addition, we use the standard quality measure (silhouette coefficient) in order to
measure the efficiency of our proposed approach. Finally, we present experimental results on both real
and synthetic data that show the performance and accuracy of our proposed technique.

Ossama, O., H. M. O. Mokhtar, and undefined, "Dynamic k-means: a clustering technique for moving object trajectories", {IJIIDS}, vol. 6, no. 4, pp. 307–327, 2012. Abstract


and Ossama E. Gouda, Adel Z. El Dein, G. A. M., "Effect of Dry Zone Formation around Underground Power Cables on Their Ratings", IEEE TRANSACTIONS ON POWER DELIVERY, vol. 26, NO. 2,, pp. 972 - 978, Submitted.
do Ossama E. Gouda, U. C.;;, U. B. de Ghada M. Amer, and U. V. S. A.(E.)- do do Adel Z. El Dein, "Redução da capacidade de corrente pela formação de zonas secas no solo", CABOS SUBTERRÂNEOS, pp. 130-142, Submitted. 2_em_portuguese_1_2010.pdf
Ossama E. Gouda1, Faculty of Energy Engineering, C. U. G. E., and A. U. A. E. Adel Zein El Dein, Faculty of Energy Engineering, "Improving underground power distribution capacity using artificial backfill materials", IET Generation, Transmission & Distribution, vol. 1, pp. 1-8, 2015. gtd-2015-0274_1.pdf
Ossama S. Alshabrawy, and A. E. Hassanien, "Underdetermined blind separation of mixtures of an unknown number of sources with additive white and pink noises", The 5th International Conference on Innovations in Bio-Inspired Computing and Applications (Springer) IBICA2014, Ostrava, Czech Republic., 22-24 June, 2014. Abstractibica2014_p29.pdf

In this paper we propose an approach for underdetermined
blind separation in the case of additive Gaussian white noise and pink
noise in addition to the most challenging case where the number of source
signals is unknown. In addition to that, the proposed approach is appli-
cable in the case of separating I +3 source signals from I mixtures with
an unknown number of source signals and the mixtures have additive two
kinds of noises. This situation is more challenging and also more suitable
to practical real world problems. Moreover, unlike to some traditional
approaches, the sparsity conditions are not imposed. Firstly, the number
of source signals is approximated and estimated using multiple source
detection, followed by an algorithm for estimating the mixing matrix
based on combining short time Fourier transform and rough-fuzzy clus-
tering. Then, the mixed signals are normalized and the source signals
are recovered using multi-layer modi ed Gradient descent Local Hier-
archical Alternating Least Squares Algorithm exploiting the number of
source signals estimated , and the mixing matrix obtained as an input
and initialized by multiplicative algorithm for matrix factorization based
on alpha divergence. The computer simulation results show that the pro-
posed approach can separate I + 3 source signals from I mixed signals,
and it has superior evaluation performance compared to some traditional
approaches in recent references.

Ossama.M.M.Abdelwahab, Assessing soil moisture content and its distribution under surface and sub-surface drip irrigation systems using neutron moisture technique, , VALENZANO, ITALY., ISTITUTO AGRONOMICO MEDITERRANEO DI BARI, 2010.
Ossama.M.M.Abdelwahab, R. L. Bingner, F. Milillo, and F. Gentile, "Best Management Practices for sediment control in a Mediterranean agricultural watershed", EGU General Assembly 2015, VIENNA, AUSTRIA, pp. Vol. 17, EGU2015-3308, 2015, 2015. egu2015-3308_sss9.9.pdf
Oteibi, F. E., and N. Sherif, "the effect of letrozole versus clomiphene citrate on ovulation induction in polycystic ovarian syndrome patients: RCT", Evidence Based Women's Health Journal, 2013.
Oteifa, B. A., M. M. Shamseldean, and M. H. El-Hamawi, "A preliminary compiled study on the biodiversity of free-living, plant-and insect-parasitic nematodes in Egypt", Egyptian Journal of Agronematology. (Egypt), vol. 1, no. (1), pp. 1–36, 1997. Abstract
Othman, A. A., S. A. Syed, A. H. Newman, and N. D. Eddington, "Transport, metabolism, and in vivo population pharmacokinetics of the chloro benztropine analogs, a class of compounds extensively evaluated in animal models of drug abuse.", The Journal of pharmacology and experimental therapeutics, vol. 320, issue 1, pp. 344-53, 2007 Jan. AbstractWebsite

Recently, extensive behavioral research has been conducted on the benztropine (BZT) analogs with the goal of developing successful therapeutics for cocaine abuse. The present study was conducted to characterize the contribution of dispositional factors in mediating the behavioral differences among the chloro BZT analogs and to identify cytochrome P450 enzymes involved in their metabolism. Bidirectional transport and efflux studies of four of the chloro BZT analogs were conducted. Screening with a panel of human and rat Supersomes was performed for 4',4''-diCl BZT. In addition, pharmacokinetic and brain distribution studies for 4'-Cl and 4',4''-diCl BZT in Sprague-Dawley rats were conducted. The permeability of the chloro analogs ranged from 8.26 to 32.23 and from 1.37 to 21.65 x 10(-6) cm/s, whereas the efflux ratios ranged from 2.1 to 6.9 and from 3.3 to 28.4 across Madin-Darby canine kidney-multidrug resistance 1 (MDCK-MDR1) and Caco-2 monolayers, respectively. The P-glycoprotein (P-gp) inhibitor verapamil reduced the efflux ratios and enhanced the absorptive transport of the chloro BZT analogs. 4',4''-diCl BZT was a substrate of human CYP2D6 and 2C19 and rat 2C11 and 3A1. The brain uptake for 4'-Cl and 4',4''-diCl BZT was comparable and higher than previously reported for cocaine (brain-to-plasma partition coefficient = 4.6-4.7 versus 2.1 for cocaine). The rank order for t(1/2) was 4',4''-diCl BZT > 4'-Cl BZT > cocaine and for steady-state volume of distribution was 4'-Cl BZT > 4',4''-diCl BZT > cocaine. In conclusion, the chloro analogs differ significantly in their clearance and duration of action, which correlates to their behavioral profiles and abuse liability. Furthermore, these results suggest that the distinctive behavioral profile of these analogs is not due to limited brain exposure.

Othman, D. A., A. A. A. Melegy, and A. Abdelhalim, Stratigraphy, Geochemical and Mineralogical Characterization of Lower Miocene Smectitic Clay Deposits, Case: South El-Hammam, Egypt., , vol. 65, issue 13, pp. 59 - 72, 2022. AbstractWebsite

This work discusses the physical, geochemical and mineralogical characterization of some bentonite resources in South El-Hammam area which are hosted in thick sandstone sequences belonging to the Lower Miocene Moghra Formation. Bentonite samples were characterized by microscopic, SEM, XRD and ICP-MS analyses. Bentonite resources in this study consist of montmorillonite as the main clay mineral of all the analyzed samples. Kaolinite also occurs as minor clay constituents. The identified non-clay minerals include; quartz, albite and calcite. The highest grade of the studied bentonite, contains Si/Al molecular ratio of 2, suggesting absence of detrital quartz. In contrary, the lowest grade of bentonite with alumina content of 15.06%, display Si/Al molecular ratio of 4.34, where free silica dominates over bentonite. The REE content of the Lower Miocene bentonite study area is strongly imparted by LREE signature. The very high CIA index (74.85 and 91.25) suggesting intense chemical weathering of source rock, which is supported by the presence of Ce abnormality, indicating that they were deposited under pluvial conditions.

Othman, M. A., A. D. Alwakil, M. Shafee, T. M. Abuelfadl, and A. M. E. Safwat, "Novel even/odd mode-based CRLH unit cells", Microwave Symposium Digest (MTT), 2012 IEEE MTT-S International: IEEE, pp. 1–3, 2012. Abstract
Othman, A. A., A. H. Newman, and N. D. Eddington, "The novel N-substituted benztropine analog GA2-50 possesses pharmacokinetic and pharmacodynamic profiles favorable for a candidate substitute medication for cocaine abuse.", Journal of pharmaceutical sciences, vol. 97, issue 12, pp. 5453-70, 2008 Dec. AbstractWebsite

GA2-50 is a novel N-substituted benztropine analog with improved potency and selectivity for the dopamine transporter. The pharmacokinetic and pharmacodynamic properties of GA2-50 were characterized as a part of its preclinical evaluation as a substitute medication for cocaine abuse. In vitro transport and metabolism studies as well as pharmacokinetic studies in rats were conducted. Effect of GA2-50 on the extracelluar nucleus accumbens (NAc) dopamine levels and on cocaine's induced dopamine elevation was evaluated using intracerebral microdialysis. GA2-50 showed high transcellular permeability despite being a P-glycoprotein substrate. GA2-50 was a substrate of human CYP2D6, CYP2C19, CYP2E1, rat CYP2C11, CYP2D1, CYP3A1, and CYP1A2; with low intrinsic clearance values. In vivo, GA2-50 showed high brain uptake (R(i) approximately 10), large volume of distribution (V(ss) = 37 L/kg), and long elimination half-life (t((1/2)) = 19 h). GA2-50 resulted in 1.6- and 2.7-fold dopamine elevation at the 5 and 10 mg/kg i.v. doses. Dopamine elevation induced by GA2-50 was significantly reduced, slower and longer lasting than previously observed for cocaine. GA2-50 had no significant effect on cocaine's induced dopamine elevation upon simultaneous administration. Results from the present study indicate that GA2-50 possesses several attributes sought after for a substitute medication for cocaine abuse.

Othman, A. I., A. A. El-Ghaffar, and A. M. Mahmoud, "Ketorolac and Warfarin Induced Renal Toxicity: Ultrastructural and Biochemical Study", Journal of Basic and Applied Zoology, vol. 80 (36), pp. 1-9, 2019.