Browsing by Author "Ali A.M."

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Clinical and laboratory profile of urinary tract infections associated with extended spectrum-lactamase producing Escherichia coli and Klebsiella pneumoniae
(International Journal of Green Economics, 2016) Al Yousef S.A.; Younis S.; Farrag E.; Moussa H.S.; Bayoumi F.S.; Ali A.M.; Department of Medical Laboratory Technology; College of Applied Medical Sciences; University of Hafr Al Batin; Hafr Al Batin; Saudi Arabia; Faculty of Women for Art; Science and Education; Ain Shams University; Egypt; Microbiology Department; Faculty of Pharmacy; MSA University; Cairo; Egypt
Background. Urinary tract infection (UTI) is mainly due to invasion of the urethra, bladder or kidneys by pathogens. The emergence of extended spectrum �-lactamases (ESBL) is responsible for frequently observed empirical therapy failures. Objectives. To study the clinical and laboratory characteristics of UTIs caused by ESBL producing Escherichia coli (E. coli) and Klebsiella pneumonia (K. pneumonia). Methods. A cross-sectional clinical and laboratory study was performed at King Khalid Hospital, Hafr Al Batin, Saudi Arabia between March 2014 to October 2015. A total of 908 urine samples from suspected UTI patients was collected. Samples were isolated on Cysteine Electrolyte-Deficient (CLED) agar. Positive cultures were identified and tested for antimicrobial susceptibility by MicroScan WalkAway-96 SI System, and then ESBL was confirmed by double disc synergy test (DDST) and phenotypic confirmatory disc diffusion test (PCDDT). Results. A total of 680 samples (288 males and 392 females) were culture positive. 520 samples (76.5%)of E. Coli were found and 160 samples of K. pneumonia were identified (23.5%). ESBL testing showed 296 (218 E. coli and 78 K. pneumonia) samples of positive isolates. Non-ESBL isolates showed highest resistance to ampicillin followed by Mezocillin and Trimethoprim-Sulphamethoxazole- which are usually recommended as the initial treatment of UTI-while ESBL isolates showed resistance to third generation cephalosporin along with Ampicillin and Trimethoprim-Sulphamethoxazole. In this study, four significant risk factors for ESBL infection such as diabetes, recurrent UTI, previous use of antibiotics and previous hospitalization were found. Conclusion. Identifying the risk factors and antibiotic susceptibility patterns associated with ESBL producing E. coli and K. pneumonia is a useful guide for treatment strategy and control of ESBL UTI. 2016 by the Association of Clinical Scientists, Inc.
Evaluation of genexpert MTB/RIF assay for direct diagnosis of pulmonary tuberculosis
(Saudi Arabian Armed Forces Hospital, 2016) Moussa H.S.; Bayoumi F.S.; Ali A.M.; Botany Department; Faculty of Women for Art; Science; and Education; Ain Shams University; Cairo; Egypt; Microbiology Department; Faculty of Pharmacy; Modern Sciences and Arts University; Cairo; Egypt; Department of Medical Laboratory Technology; College of Applied Medical Science; University of Dammam; Hafr Al Batin; Saudi Arabia
Objectives: To evaluate the performance of GeneXpert MTB/RIF assay for direct diagnosis of pulmonary tuberculosis (PTB). Methods: This is a cross-sectional study conducted between October 2013 and February 2016 at Abbassaia Chest Hospital and Ain Shams University Hospital, Cairo, Egypt. Inclusion criteria were adults between 18 and 60 years with suspected PTB and classified into 5 clinical categories based on their clinical, radiological, and laboratory findings: confirmed TB, probable TB, possible TB, unlikely TB, and not TB. Two sputum samples from each participant were analyzed by GX and the results were compared by conventional culture. Results: In total, 218 participants were enrolled: 71 had confirmed TB; 112, highly probable TB; 20, probable TB; 10, unlikely TB; and 5, no TB. The sensitivity and specificity of the GX assay were 93% and 98.3% respectively. GeneXpert was positive in 93% of confirmed TB and 2.2% of probable TB cases. Conclusions: GeneXpert is a rapid and promising technique with good sensitivity (93%) and specificity (98.3%), but it cannot be used as a standalone PTB diagnostic tool. There is a need for more GX evaluation studies in countries with low TB incidence. � 2016, Saudi Arabian Armed Forces Hospital. All rights reserved.
A low profile flexible circularly polarized antenna for wearable and WLAN applications
(Springer Verlag, 2019) Ali A.M.; El Atrash M.; Zahran S.R.; Abdalla M.A.; MSA University; Electrical Systems Eng. Department; Cairo; Egypt; Arab Academy for Science and Technology; Comm. and Elect. Engineering Dep.; Cairo; Egypt; MTC College; Electronic Engineering Department; Cairo; Egypt
A low profile, flexible, circularly polarized antenna based on the artificial material methodology is introduced in this paper. The antenna footprint is 20 mm � 15 mm, where it is excited by the Co-Planar Waveguide (CPW) configuration. Flexibility is achieved by incorporating Rogers Ultralam 3850 as the antenna substrate. By protruding an inverted T-shaped slot from the radiator to the extended CPW ground plane, circular polarization was achieved. The design radiates at 5.2 GHz with a-10 dB bandwidth of 29.7 MHz, gain of 0.7 dBic, boresight Axial Ratio (AR) of 0.86 dB, and 3 dB-AR bandwidth of 64.3 MHz. With such characteristics, the antenna is targeting wearable and Wireless Local Area Network (WLAN) applications. 2019 IEEE.
Two Elements MIMO Antenna with Asymmetric Coplanar Strip Metamaterial Configuration and EBG Hybrid Isolation
(Institute of Electrical and Electronics Engineers Inc., 2018) Abdalla M.A.; Nazif D.Z.; Ali A.M.; Electronic Engineering Department; Military Technical College; Cairo; Egypt; October University for Modern Sciences and Arts; Electrical Systems Engineering Department; Giza; Egypt
This paper introduces a compact asymmetric coplanar strip (ACS)-fed composite right/left handed (CRLH) multiple input multiple output (MIMO) antenna for multiband operation. The ACS-fed MIMO antenna is designed using two triple band antenna elements, operating at 4.6 GHz, 4.9 GHz and 5.4 GHz with good matching (reflection coefficient is less than-20 dB). By using mushroom like electromagnetic bandgap structure, further mutual coupling isolation (better than 30 dB) is achieved. The overall MIMO antenna size is compact (46.5 � 26 mm 2 ). The MIMO antenna has less than 0.02 envelope correlation coefficient (ECC) and maximum than 9.98 dB diversity gain. The results are simulated using full wave simulations. � 2018 IEEE.