Al-Amri S.M.,Shaqra University
Saudi Journal of Biological Sciences | Year: 2013
A field experiment was conducted to investigate the effect of seed presoaking of shikimic acid (30, 60 and 120. ppm) on growth parameters, fruit productivity and quality, transpiration rate, photosynthetic pigments and some mineral nutrition contents of tomato plants. Shikimic acid at all concentrations significantly increased fresh and dry weights, fruit number, average fresh and dry fruit yield, vitamin C, lycopene, carotenoid contents, total acidity and fruit total soluble sugars of tomato plants when compared to control plants. Seed pretreatment with shikimic acid at various doses induces a significant increase in total leaf conductivity, transpiration rate and photosynthetic pigments (Chl. a, chl. b and carotenoids) of tomato plants. Furthermore, shikimic acid at various doses applied significantly increased the concentration of nitrogen, phosphorus and potassium in tomato leaves as compared to control non-treated tomato plants. Among all doses of shikimic acid treatment, it was found that 60. ppm treatment caused a marked increase in growth, fruit productivity and quality and most studied parameters of tomato plants when compared to other treatments. On the other hand, no significant differences were observed in total photosynthetic pigments, concentrations of nitrogen and potassium in leaves of tomato plants treated with 30. ppm of shikimic acid and control plants. According to these results, it could be suggested that shikimic acid used for seed soaking could be used for increasing growth, fruit productivity and quality of tomato plants growing under field conditions. © 2013 .
Sheik Abdulazeez S.,Shaqra University
Journal of Taibah University Medical Sciences | Year: 2014
Objectives Strawberries contain antioxidant phytochemicals, which have been shown to beneficial against inflammation, cardiovascular disease, cancer, obesity, neurodegeneration, hyperglycaemia and associated diabetic complications. Freeze-dried strawberry powder (FSP) is effective in controlling metabolic syndrome and cardiovascular risk factors. The present investigation was designed to evaluate the effect of FSP on alloxan-induced diabetes in rats.Methods Diabetes was induced in male Wistar albino rats by intraperitoneal injection of alloxan monohydrate (150 mg/kg bw), and treatment with FSP (700 mg/day for 45 days) was started 48 h after alloxan injection. Blood glucose, insulin, C-peptide, haemoglobin, renal function markers (urea, uric acid and creatinine) and enzyme markers (aspartate and alanine transaminases and alkaline phosphatase) were assayed with suitable methods.Results Animals given alloxan had significant body weight loss, poor glucose tolerance and increased blood glucose with concomitant decreases in insulin, C-peptide and haemoglobin values, and significant (p < 0.05) changes in the levels of renal function markers and enzyme activities. Oral administration of FSP for 45 days significantly (p < 0.05) reverted the body weight loss, hyperglycaemia, biochemical parameters, enzyme activities and insulin levels to near normal levels.Conclusions FSP can revert alloxan-induced diabetes and its complications. The antioxidant properties of the fruit probably play a major role in the observed changes. © 2014 Taibah University.
El-Nahass M.M.,Ain Shams University |
Hassanien A.M.,Shaqra University
Radiation Physics and Chemistry | Year: 2014
The effect of γ-irradiation (6. kGy) on the optical properties of thermally evaporated perylene-66 (dye content 40%) thin films has been reported. The optical constants (refractive index, n, and absorption index, k) of the as-deposited and γ-irradiated films have been obtained in the wavelength range 200-2500. nm using spectrophotometric measurements at nearly normal incidence. The obtained optical constants were used to estimate the type of transition for the as-deposited and irradiated films. The single oscillator model and Drude model of free carriers' absorption were used for the analysis of refractive index dispersion, in the normal dispersion range, before and after γ-irradiation. © 2013 Elsevier Ltd.
Kuddus M.,Integral University |
Kuddus M.,Shaqra University |
Critical Reviews in Microbiology | Year: 2012
Microbial proteases that occupy a pivotal position with respect to their commercial applications are most important hydrolytic enzymes and have been studied extensively since the advent of enzymology. Cold-adapted microorganisms are potential source of cold-active proteases and they have been isolated from the cold regions. Although there are many microbial sources available for producing proteases, only few are recognized as commercial producer. Cold-active proteases along with their producing microbes are of commercial value and find multiple applications in various industrial and biotechnological sectors such as additives in detergents, additives in food industries, environmental bioremediations, biotransformation and molecular biology applications. Therefore, cold-active proteases are the enzymes of choice for many biotechnologists, microbiologists, biochemists, environmentalists and biochemical engineers. In the present review, we discuss some novel sources along with recent developments in production and biotechnological applications of cold-active microbial proteases. © 2012 Informa Healthcare USA, Inc.
Othman M.I.A.,Zagazig University |
Othman M.I.A.,Shaqra University |
Abbas I.A.,Sohag University
Meccanica | Year: 2011
The propagation of plane waves in fibre reinforced, rotating thermoelastic half-space proposed by Lord-Shulman is discussed. The problem has been solved numerically using a finite element method. Numerical results for the temperature distribution, the displacement components and the thermal stress are given and illustrated graphically. Comparisons are made with the results predicted by the coupled theory and the theory of generalized thermoelasticity with one relaxation time in the presence and absence of rotation and reinforcement. It is found that the rotation has a significant effect and the reinforcement has great effect on the distribution of field quantities when the rotation is considered. © Springer Science+Business Media B.V. 2010.