http://hdl.handle.net/123456789/2235 البحث عن قناة بحث http://repository.ksu.edu.sa/jspui/simple-search http://hdl.handle.net/123456789/7303 العنوان: Evaluation of antifungal activity of vitavax and Trichoderma viride against two wheat root rot pathogens<br/><br/>المؤلفون: Abu-Taleb, Amira M.; Al-Mousa, Amal A.<br/><br/>ملخص: Objective: This study evaluated the effectiveness of applying the chemical “vitavax”, the biologicalcontrol product “plant guard” and the fungal isolate T. viride to control two wheat root rotpathogens, Drechslera biseptata and Fusarium moniliforme in vitro and in vivo.Methodology and results: Vitavax, plant guard and non-sterilized culture filtrate (NSCF) ofTrichoderma viride completely inhibited the growth and sporulation of F. moniliforme whenapplied at high doses. Hyphal extension and sporulation of D. biseptata ceased in mediumamended with higher doses of NSCF of T. viride while amending the culture medium with 4%plant guard completely inhibited sporulation only. Infestation of soil with either pathogen wasassociated with root rot of wheat seedlings, decreasing emergence of seedlings and low values ofgrowth parameters of wheat root and shoot. Photosynthetic pigments, carbohydrates, proteinsand phenolic compounds in the host tissues decreased due to infection. Application of chemicaland biological control, either alone or in combination, improved the biochemical parameters in thetreated seedlings. Mechanisms of action may include induction of host resistance as wasobserved from the improved emergence and growth of seedlings as well as reduced diseaseseverity. T. viride was most effective in controlling the two pathogens, both in vitro and in vivo.Conclusion and application of findings: Chemical and biological control were efficient against rootrot pathogens in vitro and in vivo. Application of T. viride alone or in combination with vitavax is apromising approach for managing wheat root rot. Tue, 01 Jan 2008 00:00:00 GMT http://hdl.handle.net/123456789/2613 العنوان: On the exact and numerical solution of the time-delayed burgers equation<br/><br/>المؤلفون: Fahmy, E.S.; Raslan, K.R.; Abdusalam, H.A.<br/><br/>ملخص: The time-delayed Burgers equation is introduced and the improved tanh-function method is used toconstruct exact multiple soliton and triangular periodic solutions. For an understanding of the natureof the exact solutions that contained the time-delay parameter, we calculated the numerical solutions ofthis equation by using the Adomian decomposition method to the boundary value problem. Tue, 01 Jan 2008 00:00:00 GMT http://hdl.handle.net/123456789/2450 العنوان: Characterization of continuous functions on open connected subset of Rn¤<br/><br/>المؤلفون: Azmi, Fatima M.<br/><br/>ملخص: Let A be a Fr¶echet * algebra with n- pairwise commuting self adjoint generators and with no non trivial idempotent. By imposing the condition that the joint spectral image of the generators contains no boundary points, we are led to a de¯nition of n-special F¤ algebra, and prove that the character M(A) of A is homeomorphic to an open connected subset of Rn. Then by adopting a suitable eneralization of the Gelfand Naimark theorem, we characterize the algebra of all continuous complex valued functions de¯ned on open connected subset of Rn.<br/><br/>وصف: College of Science and Medical Studies King Saud University. P.O. Box 22452 Riyadh 11405, Saudi Arabia, e-mail: fazmi©ksu.edu.sa Mon, 01 Jan 2007 00:00:00 GMT http://hdl.handle.net/123456789/1367 العنوان: Conductometric titrations of hydralazine hydrochloride using chloranilic acid and ammonium reineckate<br/><br/>المؤلفون: Sahl Okdah, Malek Mohammed<br/><br/>ملخص: A simple, rapid and sensitive conductometric titration method was desigend to determine hydralazine hydrochloride concentrations in the range of 0.20-23.0 mg using a chloranilic acid and ammonium reineckate as titrants. The effect of the solvent ratio, reagent concentration, time equilibrium and temperature on the shape of the titration curve was studied. Statistical treatment of the experimental results indicates that this method is precise and accurate. The accuracy of the method is indicated by the excellent recovery, i.e. ( 99.9-100.1 %) and the precision is supported by the low standard deviation value (i.e. 0.1 ). The sensitivity of the proposed method is discussed and the results are compared withthe pharmacopoeial method. Keywords: Hydralazine, chloranilic acid, reineckate, conductometric, titration. Sat, 01 Jan 2000 00:00:00 GMT