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Articles by R. Khan
Total Records ( 5 ) for R. Khan
  Amir Zaman Khan , H. Khan , Adel Ghoneim , R. Khan and Azza Ebid
  The objective of present study was to evaluate the relationship between different planting dates, densities and cultivars on soybean seed germination and vigor of seeds from plant growing in the field. Seeds of two soybean cultivars (Epps, [MG] V and Williams 82, [MG] III) were produced in the field from four planting dates and three planting densities in Peshawar, NWFP-Pakistan during 2000 and 2001. Brown (mature) pods were harvested, threshed and all shriveled and abnormal seeds were removed before determining standard germination and other vigor tests. Standard germination and other vigor tests decreased linearly (R2 = 0.53) from early planting dates to delay planting dates. Similar trend of decrease was observed from low planting density to high planting density. The decrease in AA was curvilinear (R2 = 0.78) and germination reached 15% in May planted crop. Seeds of Williams 82 was more sensitive to high temperature stress than seeds of Epps and seed vigor (AA) were much more sensitive to high temperature stress than was standard germination. Present findings support the results of experiments in controlled environments by demonstrating that high temperature during seed filling in the field, without seed infection with P. longicolla or physical injury, reduced soybean seed germination, vigor and all quality parameters of soybean seed under temperate environment.
  S.A. Saeed , H. Rasheed , T.M. Ali , Y. Qazi , S. Kabraji , L. Paul , R. Khan , F.A. Hussain and S. Ahmad
  This study was conducted to investigate the effects of nimesulide in platelet aggregation. It shows that nimesulide (1-100 μ M) inhibited platelets aggregation induced by adrenaline, (20-200 μ M). It also inhibed thromboxane A2 (TXA2) formation by platelets at low concentration (IC50; 1 μ M). However, much lower concentrations of nimesulide (0.01-0.1 μ M) potentiated the aggregatory response of subthreshold concentrations of adrenaline (0.2-2 μ M). Such an effect was blocked by Ca2+-channel blockers, verapamil and diltiazem (IC50: 7 and 46 μ M, respectively), nitric oxide donor, SNAP (IC50: 2 μ M) and cinchonine (10 nM) but not by genistein (up to 10 μ M). These results are indicative of the concentration-dependent dual effects of nimesulide on human platelet aggregation. The synergistic effect of low doses of nimesulide and adrenaline seems to be mediated through inhibition of multiple signaling pathways.
  A. Khan , Y. I. Khattak and R. Khan
  The paper describes the possibility of extending the storage life of onions by gamma radiation, which poses a serious storage problem in the hot summer months in Pakistan. Bulbs were irradiated at a dose of 0.10 kGy and stored, alongwith unirradiated control, under ambient conditions for a period of 4 months. The weight loss varied between 15 and 23 after the storage period. It was found that losses through dehydration were less in the Desi than in the Red Variety. The rotting ranged from 6.5-9.4 per cent in the irradiated onions and 12.4-12.8 per cent in the unirradiated bulbs after 4 months storage. Quality evaluation tests revealed that the internal and external quality of the irradiated samples scored higher than the corresponding controls. The cost of onions irradiation was calculated to be Rs.290.00 per tonne.
  A. Khan , Y. I. Khattak and R. Khan
  Potatoes (Varieties: Cardinal and Patrones) were irradiated at a dose of 0.10 kGy in Co-60 Irradiator and stored at 20 C for a period of 4 months. There was 5 and 3 per cent rotting in control and 9 and 5 per cent rotting in irradiated tubers in Cardinal and Patrones respectively at the end of 4 months storage period. The sprouting percentage at the end of 4 months was 51 and 59 in unirradiated tubers in Cardinal and Patrones varieties whereas no sprouting was observed in the irradiated potatoes in both the varieties. The weight loss was more (8.3 and 6.6 %) in the control than the irradiated tubers (6.7 and 5.7 %) in Cardinal and Patrones varieties at the end of 4 months storage period. Effect of radiation and storage was significant on ascorbic acid but negligible on sugars. Sensory quality was improved as a result of radiation treatment. The cost economics for food irradiation based on a source strength of 59 kCi was Rs. 290 per tonne.
  Amir Zaman Khan , H. Khan , R. Khan , Adel Ghoneim and Azza Ebid
  To evaluate the effect of different wheat seed categories with farmer’s seed for yield and yield components. An experiment was conducted at Agriculture Research Farm, NWFP Agricultural University, Peshawar, during 2003-04. The experiment was laid out in Randomized Complete Block (RCB) design with four replications. The seed categories were pre-basic, basic and certified seed of wheat varieties Bakhtawar-92 and Fakhri Sarhad from CCRI, Pirsabak and were compared with farmer’s seed of the same varieties collected from 4 location of the province. Maximum emergence m-2 (183) was recorded from pre-basic seed of Bakhtawar-92 and Fakhri Sarhad collected from CCRI, Pirsabak followed by basic and certified seed category of the same location. Farmer’s seed collected from Peshawar locality gave minimum emergence m-2 (73) among different seed categories. Pre-basic cateroy of Bakhtawar-92 obtained from CCRI, Pirsabak gave maximum spikes m-2 (347.3), grains spike-1 (52.30), biological yield (11500 kg ha-1), grain yield (4931 kg ha-1), thousand grain weight (52.75 g) and harvest index (43.11%), followed by basic and certified categories of the same varieties and location. Among farmer’s seed, Bakhtawar-92 collected from Charsadda and Nowshera locality performed better in all yield parameters as compared to other locations. Farmer’s seed collected from Peshawar and Mardan performed poorly in maximum yield parameters. It is concluded that pre-basic seed of Bakhtawar-92 and Fakhri Sarhad obtained from CCRI, Pirsabak showed better performance in all agronomic parameters and may be recommended for higher production under the agroclimatic conditions of NWFP-Pakistan.
 
 
 
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