http://hdl.handle.net/123456789/2071 Search the Channel search http://repository.ksu.edu.sa/jspui/simple-search http://hdl.handle.net/123456789/17888 Title: Effect of ulceration on rat gastric tissue polyamine contents in response to different procedures; inhibition of these effects by cimetidine<br/><br/>Authors: Al-Shabanah, OA; Raza, M<br/><br/>Abstract: The effects of cimetidine an H-2 receptor histamine antagonist on aspirin- and cold-restraint-stress-induced gastric lesions have been studied in rats. Cimetidine had a pronounced inhibitory effect on gastric lesions induced by either oral administration of aspirin (400 mg kg(-1)) or by cold-restraint stress in rats. These inhibitory effects were dose-related in the aspirin treatment group being 47 and 85% (p < 0.05 and P < 0.001) at 37.5 and 75 mg kg(-1) doses, respectively, when compared to the control. Cimetidine was found effective in cold stress but inhibition with the low dose was not significant. However, high dose (75 mg kg(-1)) showed a significant reduction (P < 0.01) in lesion index. In another series of experiments with the same regimen, the effects of different ulcerogenic procedures on the rat gastric tissue polyamine contents (putrescine, spermine and spermidine) and monoacetyl derivatives (N-1- and N-8-acetylspermidine) have been investigated by using HPLC method. The procedure permits use of n-octane sulphonate as an ion pairing agent on the reversed-phase column. The treatment of rats with aspirin caused a substantial decrease in the concentration of different polyamine contents in the glandular part of stomach tissue. Pretreatment with cimetidine showed a marked protection against this decline in polyamine contents at both the doses tested (37.5 mg kg(-1) and 75 mg kg(-1)) and increased the contents of spermidine and spermine above the control values. In the other part, cold-restraint stress also declined the polyamine contents. Low dose of cimetidine was found ineffective in this model. However, a high dose of cimetidine caused a significant rise in the levels of spermidine and spermine (P < 0.001 and p < 0.01, respectively) above the control levels. These findings suggest that cimetidine, besides being a H-2-receptor antagonist, prevents ulcer formation due to its growth promotional properties, possibly through an increase in tissue polyamine contents that offer a defense barrier against the oxygen-derived free radicals involved in the etiology of ulceration. It is also suggested that the rise in polyamine contents of gastric tissue is a crucial event in cytoprotection against destructive stimuli. (C) 1999 Academic Press. Fri, 01 Jan 1999 00:00:00 GMT http://hdl.handle.net/123456789/7920 Title: Goat production in Oman : management and possible improvements<br/><br/>Authors: Al-Marshudi, A.S.; Al-Sharji, K.M.; Zaibet, L.<br/><br/>Abstract: This paper examines the effect herd size, fodder, capital, watercondition and management on goat gross revenue in Oman. Therewere several essential results. First, there is a strong positiverelationship between some of the mentioned variables, namely fodderand labor, with gross revenue. Second, increasing goats herd sizeshows a positive effect on revenue. However, as size become large sothat input exceed output we get what economist referred as the law ofdimishing return. Third, Factors such as water condition andmanagement practice are of some important on the goat productionsystem. A program and policy effort to encourage farmers to useinnovation for animal husbandry will no doubt improve theproductivity of tradition goat system in Oman.<br/><br/>Description: Department of Agricultural economics and Rural Studies, College of Agriculture,Sultan Qaboos University, P.O. Box 34, Al Khod 123, Sultanate of Oman Mon, 01 Jan 2001 00:00:00 GMT http://hdl.handle.net/123456789/7916 Title: Biological Studies on the Okra Moth , earias vittella (F.) (lepidoptera: noctuidae ) in Jeddah, Saudi Arabia<br/><br/>Authors: Al-Mehmmady, Roqaya M.<br/><br/>Abstract: The life cycle study on Earias vittella (F.) (=Earias fabia Stoll.),reared in natural conditions at the laboratory , on okra pods throughoutone year (1995-1996), revealed that the egg incubation, larval, pupalduration ranged from : 1-5, 6-26 and 5-14 respectively, and the adultmale and female longevities both ranged between 8 and 30 days. Eggmortality was 8.13 % at 31.3 + 0.64°C , 67 + 8.93% R.H. and 0.81%at 27.5 + 2.05C and 58 + 7.34% R.H. Temperature did not influencethe viability of pupae, the percentage of moth emergence - at allmonths - ranged between 85.07% and 97.79 %. Unmated femaleslived longer than mated ones . The moth had 13 generations per yearat an average temperature of 28.65 ± 0.98°C and 60.51 ± 0.9% R.H,from October 1995 to September 1996 with an average generationtime of 38.55 ± 1.28 days. Sat, 01 Jan 2000 00:00:00 GMT http://hdl.handle.net/123456789/7303 Title: Evaluation of antifungal activity of vitavax and Trichoderma viride against two wheat root rot pathogens<br/><br/>Authors: Abu-Taleb, Amira M.; Al-Mousa, Amal A.<br/><br/>Abstract: 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