Elbandy M.,Suez Canal University |
Elbandy M.,Jizan University |
Rho J.R.,Kunsan National University |
Afifi R.,Suez Canal University
European Food Research and Technology | Year: 2014
The edible portion of sea cucumber, body walls, is a source of natural bioactive compounds. Triterpene saponins are the main chemical constituents in sea cucumber that have potential interest for the body health and food industry. Twenty-one lanostane-type non-sulphated triterpene glycosides were isolated from the methanol/methylene chloride extract of the body walls of Bohadschia cousteaui. Ten new saponins called coustesides A (1), B (3), C (9), D (10), E (11), F (12), G (15), H (16), I (17) and J (18), including two pentasaccharide and eight hexasaccharide saponins, together with eleven known triterpene glycosides, were isolated by reversed-phase semi-preparative HPLC. Their structures were mainly determined by 1D- and 2D-NMR (1H, 13C, COSY, TOCSY, HSQC, HMBC and ROESY) as well as MS experiments and acid hydrolysis. Most of the isolated compounds showed good antifungal activity against Candida albicans. Moreover, sea cucumber B. cousteaui is a rich source of biologically active saponins. Therefore, sea cucumbers are eaten for their therapeutic values as a functional food than for their seafood taste. © 2014 Springer-Verlag Berlin Heidelberg.
Mohamed S.F.,National Research Center of Egypt |
Mohamed S.F.,Jizan University |
Mahmoud G.A.,National Center for Radiation Research And Technology |
Taleb M.F.A.,National Center for Radiation Research And Technology |
Taleb M.F.A.,University of the Humanities
Monatshefte fur Chemie | Year: 2013
pH-Sensitive hydrogel was synthesized by gamma radiation crosslinking for sodium alginate extracted from the marine brown alga Turbinaria decurrens and acrylic acid. Preparation of the hydrogels involved free radical polymerization of a combination of acrylic acid (w = 0.2) and different contents of sodium alginate (w = 0.05, 0.10, and 0.15) in aqueous solution using gamma rays of a 60Co source at an irradiation dose rate of 1.2 kGy/h. The swelling behavior of the prepared hydrogel was determined by investigating the swelling time, pH of medium, and alginate content in the hydrogel. The results showed that the hydrogel reached the equilibrium swelling state in water after 6 h. The hydrogel was found to be pH responsive. The drug loading and in vitro release properties of the hydrogel were also evaluated using chlortetracycline hydrochloride as the model drug. The adsorption isotherm studies by batching techniques under the effect of different initial feed concentrations of drug, different pH values, and different sodium alginate content of the adsorbent hydrogel were investigated. The diffusion of chlortetracycline hydrochloride within the hydrogel was found to be of non-Fickian character. The kinetic parameters such as the diffusion exponent, diffusion constant, and diffusion coefficient were also evaluated. © 2012 Springer-Verlag.
Elbandy M.,Suez Canal University |
Elbandy M.,Jizan University |
Rho J.-R.,Kunsan National University
Phytochemistry Letters | Year: 2014
Raw lupin seeds flour is increasingly used as a food ingredient because of its nutritional and functional values. This study is considered to be the first phytochemical investigation of the flavonoids of the methanol (MeOH) fraction of Lupinus termis seeds. The study led to the isolation of two new di-C-glycoside flavones, apigenin-6-C-β-d-glucopyranosyl-8-C-[β-d-apiofuranosyl-(1 → 2)]-β-glucopyranoside (1), apigenin-6-C-β-d-glucopyranosyl-8-C- [α-l-rhamnopyranosyl-(1 → 2)]-β-glucopyranoside (2), together with one known flavone di-C-glycoside, apigenin-7-O-β-d-apiofuranosyl-6,8- di-C-β-glucopyranoside (3). These compounds are considered to have potential functional properties. The isolated compounds may contribute to the yellow color of raw lupin seeds flour-based products. It may also be used as natural yellow color in food or pharmaceutical products and as a dietary supplement product. These rare flavones were purified by using semi-preparative HPLC. The structures of the isolated compounds were elucidated on the basis of extensive spectroscopic methods, 1D and 2D nuclear magnetic resonance techniques, FAB (Fast Atom Bombardment) - mass spectrometry and acid hydrolysis. © 2014 Phytochemical Society of Europe.
Atia Y.,Electronics Research Institute of Egypt |
Zahran M.,Electronics Research Institute of Egypt |
Zahran M.,Jizan University |
Al-Hossain A.,Jazan University
WSEAS Transactions on Systems and Control | Year: 2011
This paper describes a novel data acquisition system designed and implemented with facilities for measuring and monitoring the characteristics of a PV solar cell, module and/or system. The functioning of the equipment is based on the so-called virtual instrumentation. This is a non-conventional concept, however it does not have the many limitations in other systems. Additionally, the whole equipment can be implemented at significantly lower cost than the commercial one. The dark characteristics test facility, based on LabVIEW software to design an easy handling Graphical User Interface (GUI) and use a single chip microcontroller with a serial interface. The system is used to acquire the measured data from the cell under test and transfer it to a supervisory computer for monitoring and other signal processing. The preliminary test we have made indicates that the equipment we propose here is highly reliable, which allows measuring and monitoring variety of solar cell characteristics with a good accuracy.
Oshaba A.S.,Electronics Research Institute of Egypt |
Oshaba A.S.,Jizan University
Research Journal of Applied Sciences, Engineering and Technology | Year: 2013
High speed Switched Reluctance Motors (SRMs) have recently been gaining attention as contenders in many variable speed drive applications. This has also been stimulated by recent advances in power electronic technology which enables this drive system for many applications such as high speed water pump and space and military applications. This study presents the design and control of high speed four phases SRM suitable for high speed water pumping and other high speed variable load applications. The dynamic load characteristic and the SRM operation modes have been studied and a novel cascade control strategy is designed and implemented using the MathLap Simulink. The SRM drive system is tested and encouraging results were obtained. The results are of prime importance in the developments of rural and remote areas and also for space and military applications. © Maxwell Scientific Organization, 2013.
PubMed | Dr Dy Patil Dental College & Hospital and Jizan University
Type: Journal Article | Journal: The journal of contemporary dental practice | Year: 2016
The Golgi apparatus or complex, a highly dynamic organelle, is a factory in which proteins are processed and sorted for transport to various target organelles.(1) It was first discovered by Camillo Golgi in 1898 and was described as an intracellular reticular apparatus stained by the black reaction in neuronal cells.(1,2) Despite of several research works, this complex remains one of the most inexplicable structures of the cytoplasmic organelles.
Zaki M.F.,Egypt Atomic Energy Authority |
Zaki M.F.,Jizan University
International Journal of Engineering Research in Africa | Year: 2016
In this paper, low-density polyethylene (LDPE) was irradiated by argon ion with different fluences up to 1015 ions/cm2. The optical, chemical and mechanical properties have been investigated using UV-Vis spectroscopy, FTIR and Micro-indentation tester, respectively. The results showed the ion beam bombardment induced decreases in the transmittance of the irradiated polymer samples. This change in transmittance can be attributed to formation of conjugated bonds i.e. possible formation of defects and/or carbon clusters. The indirect optical band gap decreased from 3.0 eV for pristine sample to 2.3 eV for that sample irradiated with the highest fluence of Ar ion beam. Furthermore, the number of carbon atoms and clusters increased with increasing the Ar ion fluences. FTIR spectra showed changes in the chemical properties of the bombarded polymer samples. Argon ion beam inducing increasing in the Vicker's micro-indentation, which may be attributed to the increase in the carbon concentration on the irradiated surface samples and crosslinking effects in the irradiated polyethylene chains. © 2016 Trans Tech Publications, Switzerland.
Zaki M.F.,Egypt Atomic Energy Authority |
Zaki M.F.,Jizan University
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2016
In this paper, low-density polyethylene (LDPE) was irradiated by argon ion with different fluences up to 1015ions/cm2. The optical, chemical and hardness properties have been investigated using UV-Vis spectroscopy, Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM) and micro-indentation tester, respectively. The results showed the ion beam bombardment induced decreases in the transmittance of the irradiated polymer samples. This change in transmittance can be attributed to the formation of conjugated bonds i.e. possible formation of defects and/or carbon clusters. The indirect optical band gap decreased from 3.0 eV for the pristine sample to 2.3 eV for that sample irradiated with the highest fluence of the Ar ion beam. Furthermore, the number of carbon atoms and clusters increased with increasing Ar ion fluences. FTIR spectra showed the formation of new bands of the bombarded polymer samples. Furthermore, polar groups were created on the surface of the irradiated samples which refer to the increase of the hydrophilic nature of the surface of the irradiated samples. The Vicker's hardness increased from 4.9 MPa for the pristine sample to 17.9 MPa for those bombarded at the highest fluence. This increase is attributed to the increase in the crosslinking and alterations of the bombarded surface into hydrogenated amorphous carbon, which improves the hardness of the irradiated samples. The bombarded LDPE surfaces may be used in special applications to the field of the micro-electronic devices and shock absorbers. © 2016 Elsevier B.V. All rights reserved.
Kanaparthy A.,Jizan University |
Kanaparthy R.,Jizan University
Journal of Clinical and Diagnostic Research | Year: 2016
Introduction: Root canal treatment enjoys a high success rate all over the world and has saved billions of teeth from extraction. However, there are instances of failure, the main causes being insufficient cleaning and inadequate obturation. In such cases the most conservative treatment option would be non-surgical retreatment. It requires regaining access to the entire root canal system through removal of the original root canal filling thus permitting further cleaning and re- obturation. Removal of gutta-percha and sealer becomes a critical step to gain access to the root canal system, remove necrotic tissue debris, bacteria and infected dentin. Aim: To compare and evaluate the efficacy of manual hand Hedstrom files and two rotary retreatment file systems ProTaper Universal retreatment files and MtwoR(retreatment) files in the removal of root canal filling material during root canal retreatment and the influence of the type of sealers zinc oxide eugenol and AH plus on the presence of remaining debris in the reinstrumented canals in the apical, middle and coronal third. Materials and Methods: Sixty single rooted human premolar teeth were divided into 3 Groups of 20 teeth each Group I (20 Teeth): prepared using hand K Files, Group II (20 Teeth): prepared using ProTaper rotary system and Group III (20 Teeth): prepared using Mtwo rotary system. Groups- IA, IIA, IIIA: (10 teeth each) Obturation was done using Zinc Oxide Eugenol sealer and gutta percha. Groups- IB, IIB, IIIB: (10 teeth each) obturation was done with AH Plus sealer and gutta percha. All the teeth were subjected to retreatment. Groups IA and IB with Hedstrom files, Groups IIA and IIB with ProTaper retreatment files and for Groups IIIA and IIIB with Mtwo retreatment Files. The roots were longitudinally split and were observed under a stereomicroscope for remaining amount of filling material on the canal walls. Statistical analysis was done using One-way Anova(Analysis of variance) test and Tukey HSD Test. Results: MtwoR files showed statistically significant difference in the removal of filling material in the apical third and ProTaper R in the coronal and apical thirds. Better cleaning efficacy was seen in canals obturated with zinc oxide eugenol sealer. MtwoRfiles showed better removal of filling material than ProTaper R followed by Hedstrom files, even though there was no statistically significant difference. Conclusion: None of the instrument group showed complete removal of the filling material. It is easier to remove zinc oxide eugenol sealer than AH plus sealer. © 2016, Journal of Clinical and Diagnostic Research. All rights reserved.
Arab S.,King Abdulaziz University |
Alshikh A.,Jizan University
Life Science Journal | Year: 2010
A novel sensor was developed for simultaneous detection of Pb, Cd, Cu and Zn concentration based on the differential pulse anodic stripping voltammetry techniques. Response (DPSV) performed on a hanging mercury drop electrode (HMDE). The estimation of Pb, Cd, Cu, Zn concentration in the mineral water of Al - Qasim, Hana Al Qasim, Najran, Nova, Safa Makah, and Mozn Jazan drinking water in the Kingdom of Saudi Arabia was accomplished.