Riyadh, Saudi Arabia

Dar Al Uloom University

Riyadh, Saudi Arabia

Dar Al Uloom University is a university in Saudi Arabia. Dar Al Uloom University offers a wide range of programs for Saudi and international students. All programs offer academic training and are accredited by the Saudi Ministry of higher Education. Wikipedia.

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Azar S.M.,Dar Al Uloom University | Mousa A.A.,Middle East University at Amman | Khalifeh J.M.,University of Jordan
Intermetallics | Year: 2017

Density functional theory calculations based on full potential linearized augmented plane-wave (FP-LAPW) plus local orbital method in the framework of GGA-PBE, as embodied in the WIEN2k code, is used to investigate the structural, electronic and magnetic properties of intermetallic Ti1+xFeSb Heusler compounds, where (x=−0.75,−0.50,−0.25,0.0,0.25,0.50,0.75,1.0). Moreover, the Tran-Blaha parameterized of the modified Becke-Johnson (TB-mBJ) exchange potential, as a semi-local method, is employed to predict the bandgap more precisely. The physical characteristic of these systems are found to be mostly determined by the crystal structure and the electron concentration or the number of valence electrons. We examined the site preference of the parent compound TiFeSb and varied the electron concentration by doping or removing a Ti atom and we found that the variation plays a crucial role in the physical properties of these material systems. Alloys with x≤0 are found to exhibit a ferrimagnetic phase, and the alloy with x=0.25 exhibits non-magnetic properties, whereas the rest have shown ferromagnetic phase. The band-structure analysis of Ti1.75FeSb and Ti2FeSb (CuHg2Ti-type) alloys suggested that they could be ferromagnetic half-metallic candidates with bandgaps 0.350 and 0.468 eV, respectively. We found that Ti rich Ti1+xFeSb alloys have high spin polarization. © 2017 Elsevier Ltd

Kamal M.,P.A. College | Arif M.,Integral University | Jawaid T.,Dar Al Uloom University
Oriental Pharmacy and Experimental Medicine | Year: 2017

In chemotherapy for tuberculosis, leprosy, cancer and stress conditions the immune system are impaired and suppressed. In such situations the effect of adaptogenic phytoconstituents are essential for healthy blood to support optimal oxygen carrying capacity which is important for stamina. The aim of this review is to bring together most of the available scientific research related to adaptogens, those are plant-derived biologically active substances. Adaptogens are the substances that appear to induce a state of non-specific increase of resistance of the organism to diverse assaults that threaten internal homeostasis and improve physical endurance. Supplementation with various plant materials which are the source of vitamins, acids, minerals and other phytoconstituents has been evaluated for their adaptogenic activity during exposure to a stressful environment. This review has been compiled using references from major databases such as Chemical Abstracts, Science Direct, Medicinal and Aromatic Plants Abstracts, SciFinder, PubMed, Dr. Duke′s Phytochemical and Ethnobotanical Databases. Nature is a rich source of biological and chemical diversity and a number of plants in the world have been used in traditional medicine remedies. This work constitutes a literature review on medicinal plants with its chemical constituents showing adaptogenic properties. Various medicinal plants with its phytochemical constituentsareshowing adaptogenic properties and it is used during chemotherapy in which the immune system are impaired and suppressed. © 2017, Institute of Korean Medicine, Kyung Hee University and Springer Science+Business Media Dordrecht.

Mnaouer A.B.,Dar Al Uloom University | Foh C.H.,Nanyang Technological University | Chen L.,Nanyang Technological University
Wireless Communications and Mobile Computing | Year: 2013

In this work, we present a new generic polymorphic routing protocol tailored for vehicular ad hoc networks (VANETs). Similar to the case of mobile ad hoc networks, the routing task in VANETs comes under various constraints that can be environmental, operational, or performance based. The proposed Polymorphic Unicast Routing Protocol (PURP) uses the concept of polymorphic routing as a means to describe dynamic, multi-behavioral, multi-stimuli, adaptive, and hybrid routing, that is applicable in various contexts, which empowers the protocol with great flexibility in coping with the timely requirements of the routing tasks. Polymorphic routing protocols, in general, are equipped with multi-operational modes (e.g., grades of proactive, reactive, and semi-proactive), and they are expected to tune in to the right mode of operation depending on the current conditions (e.g., battery residue, vicinity density, traffic intensity, mobility level of the mobile node, and other user-defined conditions). The objective is commonly maximizing and/or improving certain metrics such as maximizing battery life, reducing communication delays, improving deliverability, and so on. We give a detailed description and analysis of the PURP protocol. Through comparative simulations, we show its superiority in performance to its peers and demonstrate its suitability for routing in VANETs. © 2011 John Wiley & Sons, Ltd.

Azam A.,Dar Al Uloom University | Qiang F.,Chongqing University
International Journal of Electronic Business | Year: 2014

Some of the most electrifying advances in our economy right away are in the realm of electronic commerce. However, many issues associated with online world still pose serious challenges to the growth of electronic commerce and affect consumer behaviour to purchase online. In this study, we test constructs from behavioural study (decomposed theory of planned behaviour (DTPB)) and online retailer ethics (consumers' perception of online retailing ethics (CPEOR)) in an integrated theoretical framework of online consumer behaviour. Exclusively, we examine how attitude, subjective norms, perceived behavioural control (PBC) and CPEOR influence online consumers' intention to purchase online and actual purchase behaviour. An empirical investigation of online consumers' behaviour in China was conducted. Forward logistic regression was used for data analysis and results showed substantial support for most of the hypotheses proposed. Managerial implications and contributions of the study were also discussed. © 2014 Inderscience Enterprises Ltd.

Azam A.,Dar Al Uloom University
International Journal of Electronic Finance | Year: 2015

This paper attempts to report a study investigating the impact of personal innovativeness in information technology (PIIT) and social influence on user continuance intention towards mobile banking. A survey was conducted among undergraduate and graduate mobile banking users in a regional university. Logistic regression procedures were deployed to analyse valid data points. The study found that among well-educated mobile banking users, user personal innovativeness as measured by PIIT and perceived usefulness, the determinants of initial adoption, remain as strong determinants of user continuance intention. PIIT also remains as the antecedent of perceived ease of use. Social influence has changed the pattern of influence on mobile banking continuance intention. Copyright © 2015 Inderscience Enterprises Ltd.

Elsayed A.S.I.,Dar Al Uloom University
Pakistan Journal of Nutrition | Year: 2016

Flavonoids have been found to play important roles in the non-enzymatic protection against oxidative stress, especially in case of cancer. Flavonoids are group of polyphenolic compounds that occur widely in fruit, vegetables, tea, cocoas and red wine. Flavonoids, including flavones, flavanone, flavonols, flavanols and isoflavones, are polyphenolic compounds which are widespread in foods and beverages and possess a wide range of biological activities, of which antioxidation has been extensively explored. This study aimed to investigate the protective and the ameliorative role of some natural products on non-enzymatic antioxidants. Green tea extract and powdered curcumin were chosen as antioxidant natural products. CD1 mice were taken as experimental model. Green tea extract was provided to mice as their sole source of drinking water and powdered curcumin was added to the diet, these were taken for four weeks. Total thiol, protein-bound thiol and nonprotein-bound thiol, were measured in brain tissue homogenate as non-enzymatic antioxidant. The results of the study concluded that, green tea extract and curcumin addition to diet ameliorate and increase the concentration of non-enzymatic antioxidants, specially protein-bound thiol. © Asian Network for Scientific Information, 2016.

Herbal medicines derived from plant extracts are being increasingly utilized to treat a wide variety of clinical disease. More attention has been paid to the protective effects of natural antioxidants against drug-induced toxicities especially whenever free radical generation is involved. Flavonoids have been found to play important roles in the non-enzymatic protection against oxidative stress, especially in case of cancer. This study aimed to investigate the alterations in biochemical parameters in serum which measure liver functions, kidney functions, serum lipids and proteins due to inhalation of gasoline and the protective effects of some natural products against gasoline toxicity. Green tea extract and powdered curcumin were chosen as antitoxicity natural products. CD1 mice were taken as experimental model. Mice were exposed to gasoline vapor 2 h/day for 3 weeks in inhalation chamber. The concentration of gasoline is 9375 ppm and the concentration of benzene is 100 fold less than gasoline in equilibrium with pure benzene being 93.75 ppm. The results concluded that: 1-Liver functions did not affect in all animal groups. 2-Increase in globulin concentration in serum was observed in gasoline group, this was lowered in the other groups. 3-Triglycerides in serum were increased by gasoline and returned near to normal control by green tea extract and curcumin addition to diet. 4-Growth rate per day was reduced with gasoline inhalation and ameliorated with curcumin, but hepatosomatic and spleenosomatic indices were not affected in all groups. © Asian Network for Scientific Information, 2016.

PubMed | Darshan Dental College and Hospital, Dar Al Uloom University, King Abdulaziz University, King Saud University and Regional Research Center
Type: Journal Article | Journal: The journal of contemporary dental practice | Year: 2016

Chemomechanical caries removal (CMCR) is an effective method of caries removal especially for primary teeth as they cause less discomfort when compared with conventional caries removal. The most significant thing about caries removal is the elimination of cariogenic bacteria. This study compares the antibacterial activity of two CMCR gels.A total of 40 primary molar teeth with carious dentin were split along the long axis in a laboratory. Total viable count (TVC) was taken for the teeth before splitting as a measure of colony-forming units per milliliter (CFU/mL). Each half was treated with either Carisolv or Carie-Care CMCR gels. Clean dentin samples were evaluated for Streptococcus mutans (SM) and Lactobacillus acidophilus (LB) after removal of carious tissue using the caries removal gels using serial dilutions and incubating on specific agar plates.The results showed significant reduction in mean TVC after use of both the CMCR gels. Both gels reduced the CFU/mL of SM and LB to a significant level (p < 0.05). However, there was no significant difference between the antibacterial activities of the two CMCR gels.The CMCR gels (Carisolv and Carie-Care) significantly reduced the residual TVC as well as SM and LB in carious primary dentin. Both CMCR gels had a similar antibacterial activity on the carious dentin of primary teeth.The CMCR gels tested have a significant antibacterial activity and can be effectively used for elimination of caries-causing bacteria in primary teeth.

PubMed | New York University, Ministry of Health, Dar Al Uloom University, King Saud University and 3 more.
Type: Journal Article | Journal: Photomedicine and laser surgery | Year: 2016

The aim of this study was to assess the bactericidal efficacy of antimicrobial photodynamic dynamic therapy (aPDT) as an adjunct to scaling and root planing (SRP) against periodontal pathogens.SRP followed by laser therapy has better clinical outcomes than conventional SRP alone.The question addressed was Does aPDT as an adjunct to SRP exhibit better bactericidal effect against periodontal pathogens than the use of SRP alone in periodontal disease? MEDLINE()/PubMed, Embase, Scopus, Web of Science, and Google Scholar databases were searched from 1977 to December 2015, using different combinations of key words. Review articles, in vitro and experimental studies, and articles in languages other than English were excluded.Seventeen clinical studies were included. Laser wavelengths and duration of irradiation ranged between 470 and 810 nm and 60 and 300 sec, respectively. All studies showed that aPDT application was effective in reducing the counts of periodontal microbes at follow-up. Four studies showed significantly reduced bacterial counts for aPDT as an adjunct to SRP compared with SRP alone. Thirteen studies showed comparable reduction in the counts of periodontal bacteria when aPDT alone or as an adjunct to SRP was compared with SRP alone.The bactericidal efficacy of aPDT as an adjunct to SRP against periodontal pathogens in periodontal disease remains debatable.

PubMed | Dar Al Uloom University, VIP Clinic Riyadh Colleges of Dentistry and Pharmacy, Tanta University, Pacific University at Udaipur and General Dental Practitioner
Type: Journal Article | Journal: Journal of clinical and diagnostic research : JCDR | Year: 2016

Autism is a neuro-developmental disorder which is manifested as impairment of social interaction, communication and a repetitive behaviour. Autism can obscure dental treatment for the affected patients; furthermore, children with autism commonly have destructive oral habits.The aims of this study were to evaluate the Modified Gingival Index (MGI), Plaque Index (PI), salivary pH and buffering capacity of the saliva among autistic children compared to normal children in Riyadh City that may provide baseline data to enable comparison and future planning of dental services for autistic children.A total of 50 children diagnosed with autism (mean age 8.5 years) were selected from Azzam Autism School, Riyadh City. The control group consisted of 50 non-autistic school children (mean age 8.7 years), gender matched, selected from Outpatient Clinic, Riyadh Colleges of Dentistry and Pharmacy. MGI, PI, salivary pH and salivary buffer capacity tests were done for all participants. The buffering capacity of the stimulated saliva was grouped under very low, low and normal. Pearsons Chi square and one way ANOVA were used to find statistical significance if any among the autistic and the normal control group.The results of the study showed that the mean standard deviation of MGI, PI and pH of unstimulated resting saliva for autistic group were 1.82 0.65, 1.92 0.35 and 6.8 0.5 respectively. Normal control group had values 1.35 0.85, 1.44 0.43 and 7 0.4 respectively. A statistically significant difference between both groups for all parameters was found. Salivary buffering capacity was found to be normal for the majority among both groups. However, 60% children among the autistic group presented with normal buffering capacity of the stimulated saliva as compared to 70% among the normal control group. However, this difference was not statistically significant (p = 0.544).Children with autism appear to have higher gingival inflammation, poor oral hygiene and a slightly lower salivary pH as compared to healthy control group. Special oral health programmes regarding treatment and maintenance of good oral health should be taken in consideration for autistic children.

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