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Roshan A.-R.A.,Ain Shams University | Gad H.A.,Ain Shams University | El-Ahmady S.H.,Ain Shams University | Khanbash M.S.,Hadramout University of Science and Technology | And 2 more authors.
Journal of Agricultural and Food Chemistry | Year: 2013

This work describes a simple model developed for the authentication of monofloral Yemeni Sidr honey using UV spectroscopy together with chemometric techniques of hierarchical cluster analysis (HCA), principal component analysis (PCA), and soft independent modeling of class analogy (SIMCA). The model was constructed using 13 genuine Sidr honey samples and challenged with 25 honey samples of different botanical origins. HCA and PCA were successfully able to present a preliminary clustering pattern to segregate the genuine Sidr samples from the lower priced local polyfloral and non-Sidr samples. The SIMCA model presented a clear demarcation of the samples and was used to identify genuine Sidr honey samples as well as detect admixture with lower priced polyfloral honey by detection limits >10%. The constructed model presents a simple and efficient method of analysis and may serve as a basis for the authentication of other honey types worldwide. © 2013 American Chemical Society. Source

Faisal W.M.,Hadramout University of Science and Technology
Alexandria Engineering Journal | Year: 2012

Using a solid state reaction to prepared many samples of YBa 2Cu 3O 7-δ And (YBa 2Cu 3O 7-δ) 1- x(Ag 2O) x by mixing the appropriate ratios of constituent oxides; BaO, CuO, and Y 2O 3 the mixture were ground to fine power and then calcined at 900 °C without Ag 2O and 930°C for using Ag 2O as impurities. The calcined black power were grounded again and molded into pellets by applying a hydrostatic pressure from (0.3-0.6) Gpa. These pellets were sintered at 950°C. Silver was added as impurities with the calcined powder with ratios of 0.3, 0.35 and 0.45 to increase its ductility. The transition temperature for the superconductor samples were done using non-contact technique. It is an easy and sensitive technique compared with four - point probe method. The maximum T c was 110 K for YBa 2Cu 3O 6.989. Evaporation deposition technique to deposited a thin film, of 2200 A°thickness on the surface of the samples and then annealed to room temperature. This technical reduces the resistance to 0.2 and makes a good ohmic contact at liquid nitrogen boiling point (77 K) metals of various conductivity such as copper, brass aluminum and iron were used to study the effect of eddy-current loss on them and then compared with the superconducting samples, with Ag 2O or without Ag 2O. The maximum power loss were obtained for the superconducting samples when they cooling at liquid nitrogen temperature. The sintered pellets were drilled manually by 6 mm drill and a slot was done along its radius, to fabricate a superconducting loop antenna for receiving magnetic field signal. The best received signal was obtained when the antenna cooled to liquid nitrogen temperature. © 2012 Faculty of Engineering, Alexandria University. Production and hosting by Elsevier B.V. All rights reserved. Source

Nassar M.M.,Minia University | El-Geundi M.S.,Minia University | Al-Wahbi A.A.,Hadramout University of Science and Technology
Desalination and Water Treatment | Year: 2012

The equilibrium modeling for adsorption of cationic dye Methylene Blue (MB) onto Yemen natural clay at different temperatures, particle size and solution pH was studied. The adsorption capacity was found to be increase with increasing temperature and pH and decreased with increasing particle size. The maximum adsorption capacity was 500.0 (mg g-1) at T = 25°C, dp = 250-355 μm and pH = 12. The data are successfully tested by Langmuir, Freundlich, Temkin and Redlich-Peterson models. It was found that the Redlich-Peterson isotherm best fit the experimental data over the whole concentration range. Thermodynamic parameters such as standard Gibbs free energy (ΔG°), standard enthalpy (ΔH°), and standard entropy (ΔS°) were calculated. The thermodynamic parameters of methylene blue/clay system indicated spontaneous and endothermic nature of the adsorption process. The results demonstrate that Yemen natural clay is very effective in the removal of MB from aqueous solution and can be used as alternative of high cost commercial adsorbents. © 2012 Desalination Publications. All rights reserved. Source

Albiti A.H.,Al Gamhouria Teaching Hospital | Adam I.,University of Khartoum | Ghouth A.S.,Hadramout University of Science and Technology
Transactions of the Royal Society of Tropical Medicine and Hygiene | Year: 2010

A cross-sectional study was conducted during the period of August 2007-April 2008 at Al-Wahda Teaching Hospital in Yemen to investigate prevalence and risk factors for placental malaria and anaemia and their effects on birthweight. Sociodemographic characteristics were gathered, maternal haemoglobin was measured and blood films were examined for malaria. Newborn birthweight was recorded. Out of 900 parturient women, malaria blood films were positive in 32 (3.6%) cases: in six sets of peripheral, placental and cord samples; in 15 placental and cord samples; and in 11 placental samples only. Malaria was not associated with age and parity, but it was significantly associated with history of fever [odds ratio (OR) 8.5, 95% CI 3.7-19, P < 0.001], rural residence (OR 2.5, 95% CI 1.1-5.3, P = 0.01) and rainy season (OR 5.1, 95% CI 1.7-15.2, P = 0.003). Overall, 694 (77.1%) out of these 900 women had anaemia (Hb < 11 g/dl) and 16 (1.8%) patients had severe anaemia (Hb < 7 g/dl). Anaemia was not associated with age, parity and malaria. Low birthweight was significantly associated with malaria (OR 5.7, 95% CI 1.7-18.5; P = 0.004). Thus, preventive measures (bednets and intermittent preventive treatment) should be employed for pregnant women regardless of their age or parity. © 2009 Royal Society of Tropical Medicine and Hygiene. Source

Bashrahil K.A.,Hadramout University of Science and Technology
Eastern Mediterranean Health Journal | Year: 2010

The irrational use of drugs remains a key health problem in many developing countries. Using WHO standard indicators of rational drug use, this study analysed 550 prescriptions from 20 health facilities at different levels throughout Hadramout governorate, Yemen. A mean of 2.8 (SD 0.2) drugs were prescribed per prescription, with a low rate of prescribing drugs by generic name (39.2%). The proportion of prescriptions for antibiotics was 66.2%, for injectable drugs 46.0% and for vitamins/tonics 23.6%. The essential drugs list was available in 78.9% of facilities and a high percentage of drugs were prescribed from the list (81.2%). Other official sources of local drug information were less available. Source

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