nasser nasser - Academia.edu (original) (raw)

Papers by nasser nasser

Eduvest - Journal of Universal Studies

The development of stem cells services has grown rapidly throughout the world since 2004, as well... more The development of stem cells services has grown rapidly throughout the world since 2004, as well as in Indonesia. This is because stem cells have unique properties that can differentiate into various cells types, making it promising to repair tissue damaged by various diseases, especially degenerative conditions. The purpose of this study was to obtain an overview of the regulation of stem cells services so that it can be carried out to the public after the enactment of the Health Law Number 36 of 2009 and to obtain an overview of the implementation of the law in stem cells regulation that is not yet comprehensive. The research methodology used is juridical normative, with a statutory approach, a conceptual approach. Also by using a comparative approach with other countries. This study analyzes substantially the regulation of stem cells and/or cells services based on Minister of Health Regulation number 32 of 2018 concerning stem cells and/or cells services and the implementation o...

Journal of multidisciplinary healthcare, 2022

Predisposition to acute illness from COVID-19 is suggested to correlate with cigarette smoking as... more Predisposition to acute illness from COVID-19 is suggested to correlate with cigarette smoking as it augments the risk of developing cardiovascular and respiratory illnesses, including infections. However, the effects of smoking on COVID-19 symptoms are not well described and controversial. In this study, we aim to explore the associations between smoking and COVID-19 symptoms. Subjects and Methods: A cross-sectional study using the Ministry of Public Health (MoPH), Qatar database was administered to a Qatari population with confirmed COVID-19 disease who filled in pre-defined phone-call questionnaire between 27th February 2020 and 31st December 2020. We analyzed 11,701 non-vaccinated COVID-19 individuals (2952 smokers and 8749 non-smokers) with confirmed RT-PCR test results. The association of smoking and the presence of symptoms as well as patient characteristics was calculated using Pearson's Chi-square and Fisher's exact tests, adjusting for potential covariates. Results: Compared with the non-smokers, symptomatic COVID-19 infection is significantly higher in smokers. In addition, we found fever as the most common symptom developed in COVID-19 patients followed by cough, headache, muscle ache, and sore throat. As compared to other symptoms, association of smoking with chills and abdominal pain was less evident (P < 0.05 and P < 0.001, respectively). However, both groups showed similar rates of developing cough. Conclusion: In conclusion, smoking is associated with COVID-19 symptoms frequency in non-vaccinated patients; nevertheless, further investigations are necessary to understand the mechanism of this association which could generate new targets for the management of COVID-19 in smoker patients.

Embedded Selforganising Systems, 2021

Facial recognition has attracted the attention of researchers and has been one of the most promin... more Facial recognition has attracted the attention of researchers and has been one of the most prominent topics in the fields of image processing and pattern recognition since 1990. This resulted in a very large number of recognition methods and techniques with the aim of increasing the accuracy and robustness of existing systems. Many techniques have been developed to address the challenges and reliable recognition systems have been reached but require considerable processing time, suffer from high memory consumption and are relatively complex. The focus of this paper is on extracting subset of descriptors (less correlated and less calculations) from the co-occurrence matrix with the goal of enhancing the performance of Haralick’s descriptors. Improvements are achieved by adding the image pre-processing and selecting the proper method according to the database problem and by extracting features from image local regions.

Dans la lutte contre l'insécurité alimentaire à Djibouti, la culture du palmier dattier s&#39... more Dans la lutte contre l'insécurité alimentaire à Djibouti, la culture du palmier dattier s'impose comme un choix pertinent. Au vue des conditions climatiques, la rareté de l'eau et surtout du fait de la mauvaise qualité de cette dernière, la salinisation se menace pour les sols agricoles. L'étude de la salinité de sols de sept périmètres agricoles susceptibles d'accueillir des cultures de palmier dattier a permis de de salinité des différents sites ne plants et que donc ces sols ne présentent aucun risque pour la mise en place de ce type de culture. Toutefois, il faudrait veiller à contrôler régulièrement le niveau de salinité de ces sols, notamment en raison de la salinisation secondaire liée à la mauvaise gestion de l'irrigation. Abstract In the fight against food insecurity in Djibouti, the date palm cultivation itself as a relevant choice. In view of the climatic conditions, water scarcity and especially because of the poor quality of the latter, secondary...

Al-Nahrain Journal for Engineering Sciences, 2021

Facial expressions are a form of non-verbal communication, they appear as changes on the surface ... more Facial expressions are a form of non-verbal communication, they appear as changes on the surface of the facial skin according to one's inner emotional states, aims, or social communications. Classification of these expressions is a normal process for humans, but it is a challenging task for machines.Lately, interest in facial expression recognition has grown, and many systems have been developed to classify expressions from facial images. Any expression recognition system is comprised of three steps. The first one is face acquisition, then feature extraction, and finally classification. The classification accuracy depends primarily on the feature extraction step. Therefore, in this research we study many texture feature extraction descriptors and compare their results under the same preprocessing circumstances; moreover, we propose two improvements for one of these descriptors, which give better results than the original one. We validate the results on two commonly used databas...

In this work we introduce new counting classes defined by special sets of natural number like Tri... more In this work we introduce new counting classes defined by special sets of natural number like Triangular, Perfect Square, Pentagonal and generally K-gonal numbers. We shall see that NP is a subclass of all complements of K-gonal classes and all K-gonal classes are subclasses of a class defined by only perfect square numbers. صفوف التعقيد العدية المضلعة في هذا العمل تم تعريف صفوف تعقيد عدية جديدة اعتمادا على مجموعات جزئية من مجموعة الأعداد الطبيعية كالأعداد المثلثية 3-gonal والمربعة 4-gonal والمخمسة 5-gonal وعموما الأعداد المضلعة K-gonal numbers وسنبين أن الصف NP هو صف جزئي من مجموعة متممات الصف المولد بالمجموعة K-gonal وأن الصفوف التي تعرفها المجموعات K-gonal هي صفوف جزئية من الصف الذي تعرفه مجموعة الأعداد المربعة فقط

Mansoura Journal of Forensic Medicine and Clinical Toxicology, 2019

Aflatoxin B1 (AFB1) is the most toxic mycotoxin that was proven to be deleterious to human and se... more Aflatoxin B1 (AFB1) is the most toxic mycotoxin that was proven to be deleterious to human and several animal species. Current work aimed at evaluating the sex-based differential hepatic genotoxic effect and the antioxidant activity as implications of subchronic aflatoxicosis B1. Albino rats were used that comprised two equal AFB1treated groups with AFB1 contaminated olive oil (50µg/kg) and a control group for each gender that received the vehicle only. Parts of animals' livers were homogenized for gene expression assessment using quantitative RT-PCR and antioxidant activity analyses. Caspase-3 immunohistopathological examination was concomitantly undertaken. Results showed that AFB1 induced significant overexpression in cell cycle proliferation (ODC1), apoptosis (Aen), and antioxidant heme oxygenase (Hmox) genes in males alongside Bax (Bcl2-associated protein) under-expression. Meanwhile, female rats showed significant overexpression for (Hmox) and under-expression of Bax and Tnf (Tumor necrosis factor). Concomitant total hepatic antioxidant activity of liver homogenates showed a reduction in males, contrasting females. Degenerate vacuolated hepatocytes, polymorphic nuclei, cellular infiltration with concomitant Caspase-3 positive cells were profound findings in male rats. Hence, AFB1 is deferentially genotoxic at the given dose especially to male rats towards carcinogenicity, oxidative stress and apoptosis compared to a brief but compensated oxidative stress in females.

Proceedings XXII Congresso Brasileiro de Autom�tica, 2018

This paper presents a new model for controlling and monitoring Industrial Automation Systems. The... more This paper presents a new model for controlling and monitoring Industrial Automation Systems. The architecture of this model does not limit it to be connected to only one specific system but makes it able to be adapted to different automation systems as well as reused for new ones, packing any industrial communication protocol. The basic components have their hard-ware and software described, as well as the interfaces with the users, with the automation system, and between components. Thus, the proposed structure is presented, and later it is shown how it is possible to reuse this system for other applications. An-other aspect of the approach is to deal with uncertain statements of the user. It allows the application to interpret these inputs. Furthermore, the application learns, over time, how to better interpret user preferences and behavior patterns.

This thesis describes the synthesis and characterization of monomeric and polymeric gold(I), silv... more This thesis describes the synthesis and characterization of monomeric and polymeric gold(I), silver(I) and platinum(II) complexes containing diphosphine dicarboxamide and pyridine carboxamide donor ligands. The major focus of the project was to characterize these complexes in the solid state using X-ray crystallography. Many of the complexes were also characterized in solution by NMR spectroscopy and electrospray ionization mass spectrometery. x 6.2 Results and Discussion……………………………………………………. 6.2.1 Synthesis and structures of cyclometalated platinum(II) complexes.. 6.2.2 Monitoring reactions by NMR………..……………………………. 6.3 Conclusion………………………………………………………………… 6.4 Experimental………………………………………………………………. 6.5 References………………………………………………………………… Chapter 7-Supramolecular chemistry of N,N'-bis(2diphenylphosphinoethyl)phthalamide and its complexes with gold(I) and silver(I)…... 7.1 Introduction………………………………………………………………... 7.2 Results and Discussion……………………………………………………. 7.3 Conclusion………………………………………………………………… 7.4 Experimental……………………………………………………………… 7.5 References………………………………………………………………… Chapter 8-Organoplatinum chemistry with a dicarboxamide-diphosphine ligand: hydrogen bonding, cyclometalation and a complex with metal-metal donor-acceptor bonds………………………………………………………………………………….. 8.1 Introduction………………………………………………………………. 8.2 Results and Discussion…………………………………………………… 8.3 Conclusion………………………………………………………………… 8.4 Experimental………………………………………………………………. 8.5 References………………………………………………………………… Chapter 9-Chemistry of gold(III) with pyridine-carboxamide ligands………………. 9.1 Introduction……………………………………………………………….. 9.2 Results and Discussion…………………………………………………… 9.2.1 Synthesis and structures of gold(III) complexes………………….. 9.2.2 Catalysis…………………………………………………………….

Journal of Maxillofacial Surgery, 1986

The application of the recently described myocutaneous flaps in 7 cases of cancrum oris defects i... more The application of the recently described myocutaneous flaps in 7 cases of cancrum oris defects is shown and the consistency of the blood supply in children is stressed. The surgical anatomy is mentioned and the use of the flaps in the reconstruction of defects of the cheek, angle of mouth, lips and chin is illustrated. The excellence of the muscle island flap in preventing reankylosis if interposed into new joints in the body of the mandible is emphasised, together with the advantages over the forehead and delto-pectoral flaps when used for the same purpose.

Proceedings Fifth Annual Structure in Complexity Theory Conference

SOLM(X) = (y : y is a solution of M on input x) is the solution space of M on input x and nM(x) =... more SOLM(X) = (y : y is a solution of M on input x) is the solution space of M on input x and nM(x) = card(SOLM(x)) is the number of solutions of M on input x. There exist at least three approaches to counting. 1. The most natural way to formulate counting problems is to say : Compute ...

Virology Journal, 2011

Background Maternal cytomegalovirus (CMV) and rubella infections have adverse neonatal outcomes. ... more Background Maternal cytomegalovirus (CMV) and rubella infections have adverse neonatal outcomes. Basic epidemiological data concerning CMV and rubella is necessary for health planners and care providers. Methods A cross sectional study was conducted at El-Rahad hospital, Sudan to investigate seroprevalence of CMV and rubella infections and associated possible risk factors among pregnant women. Structured questionnaires were used to gather socio-demographic data and ELISA was used to detect CMV and rubella infections using IgG and IgM. Results Out of 231 pregnant women, 167 (72.2%) and 151 (65.3%) were CMV-IgG and rubella-IgG positive, respectively. Only 6 (2.5%) and 8 women (3.4%) were CMV-IgM and rubella-IgM positive, respectively. While, high parity (OR = 14.7, 95%CI = 1.7 - 123.6; P = 0.01] and illiteracy (OR = 3.0, CI = 1.4 - 6.5; P = 0.004) were significantly associated with seropostive CMV-IgG in multivariate analysis, none of the other obstetrical and medical characteristics ...

Biological Trace Element Research, 2015

Diabetic retinopathy is the most common complications of diabetes mellitus that, in most occasion... more Diabetic retinopathy is the most common complications of diabetes mellitus that, in most occasions, lead to blindness. Multiple evidences linked the serum magnesium, iron and ferritin disturbance with diabetes and its complications. A case-control study was conducted at Makkah Eye Complex, Khartoum, Sudan, to compare the levels of serum magnesium, iron and ferritin in patients with diabetic retinopathy with diabetic patients without diabetic retinopathy (controls). Findings indicate that all patients had type 2 diabetes. The two groups (50 in each arm) were well matched in their basic characteristics. Median (25th-75th interquartile) of serum magnesium in patients with diabetic retinopathy were significantly lower than patients without diabetic retinopathy [1.48 (0.75-1.64) vs. 1.92 (1.4-2.3)mg/dl, P = 0.022]. The median of serum iron and ferritin were lower in cases than control group but did not reach a statistical significance [20.5 (17.2-48.0) vs. 27.0 (16.0-54.0) μg/dl, P = 0.568; 98.0 (45.0-134.75) vs. 101.0 (47.0-161.0) μg/l, P = 0.818]. The duration of diabetes [16.5 (9.3) vs. 11.2 (6.6) years; P = 0.014] and haemoglobin level [13.7 (0.9) vs. 12.5 (2.0) g/dl; P = 0.039] were significantly higher in cases group than control group. A significant inverse correlation was observed between serum magnesium and iron levels. Twenty (40 %) patients had severe non-proliferative diabetic retinopathy with mild macular edema, which is the most prevalent type among the cases group. Hypomagnesaemia among diabetic patients was associated with diabetic retinopathy, while serum iron and ferritin have no significant effect in this setting. Severe non-proliferative diabetic retinopathy with mild macular edema is the prevalent type in this study.

The Journal of the Acoustical Society of America, 1994

The long-term average speech spectrum (LTASS) and some dynamic characteristics of speech were det... more The long-term average speech spectrum (LTASS) and some dynamic characteristics of speech were determined for 12 languages: English (several dialects), Swedish, Danish, German, French (Canadian), Japanese, Cantonese, Mandarin, Russian, Welsh, Singhalese, and Vietnamese. The LTASS only was also measured for Arabic. Speech samples (18) were recorded, using standardized equipment and procedures, in 15 localities for (usually) ten male and ten female talkers. All analyses were conducted at the National Acoustic Laboratories, Sydney. The LTASS was similar for all languages although there were many statistically significant differences. Such differences were small and not always consistent for male and female samples of the same language. For one-third octave bands of speech, the maximum short-term rms level was 10 dB above the maximum long-term rms level, consistent across languages and frequency. A "universal" LTASS is suggested as being applicable, across languages, for many purposes including use in hearing aid prescription procedures and in the Articulation Index.

Journal of Oral and Maxillofacial Surgery, 2006

BMJ, 2001

After he was appointed to a demanding NHS post, he also built up a successful private practice. A... more After he was appointed to a demanding NHS post, he also built up a successful private practice. At the pinnacle of his career in 1994, he was diagnosed with ethmoid carcinoma, which had invaded his frontal lobe. After major surgery and radiotherapy, he returned to his Harley Street practice a year later on a part time basis, but further ill health forced him to retire completely in 1997. He then underwent more surgery, which ultimately led to complications and his early demise. Despite such debilitating illness, Bob kept a brave front. His interests included reading, visiting his cottage in Scotland, and tinkering with his old Land Rover. He leaves his second wife, Dawn; four children; and a granddaughter.

Facial Plastic Surgery

Autologous costal cartilage for rhinoplasty is an excellent graft material providing both volume ... more Autologous costal cartilage for rhinoplasty is an excellent graft material providing both volume and quality of cartilage required for nasal reconstruction. Commonly, the 5th, 6th, 7th, and 8th rib costal cartilages have been harvested but other ribs such as the 10th rib are often overlooked and yet offer an excellent graft option for columellar, alar rim, nasal tip, and dorsal augmentation grafts. The use of the 10th rib costal cartilage in patients with complex secondary cleft nasal deformity has scant reference in the literature. We demonstrate our simple and quick 10th rib cartilage harvesting technique and elicit its use in secondary rhinoplasty and cleft lip nasal deformities. The advantages of harvesting the 10th rib cartilage and our long-term results demonstrating ease of harvest, stability, and predicable outcomes are with several clinical cases. The senior author has used the 10th rib graft successfully in a variety of challenging secondary cleft rhinoplasty procedures wi...

An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.