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Articles by Ali Raza
Total Records ( 3 ) for Ali Raza
  Zia Ahmad Chatha , Asif Ahmad , Tahir Zahoor and Ali Raza
  Use of gamma irradiation and UV-C was compared over conventional used hot water treatment on mango pulp and peel. The storage study was also carried out to explore the potential of these techniques for the retention of total polyphenolic substances and antioxidants activity. Results indicated that polyphenolic substances decreased during storage. This decline in polyphenolic substances can be controlled by using gamma irradiation and UV-C treatment in mango peel and pulp. Lower doses (0.5 KGY) is more effective in controlling these losses. Comparing the varietal differences, white chaunsa showed better phenolic and antioxidant retention potential as compared to black chaunsa.
  Zia Ahmad Chatha , Asif Ahmad , Tahir Zahoo , Ali Raza and Muhammad Kaleem
  The comparative effect of gamma irradiation doses (0.5 kGy), UV-C-30 min and hot water 55°C-10 min on fungal load and aflatoxin production was evaluated on mango (black chaunsa). Thirteen fungal species were isolated from the surface of mango fruits (Mangifera Indica L.), among these the frequency of Aspergilus niger, Aspergillus flavus and Cladosporium cladosporoides was higher. Fungal load can be controlled best by using gamma rays at 0.5 KGy dose level followed by UV-C irradiation treatment while maximum load was found in control group. It appeared that non thermal techniques (gamma irradiation and UV-C) are comparatively better over control and conventionally used hot water treatment. Regarding the production of aflatoxins by these isolates, gamma irradiation treated samples showed less production of aflatoxin. Based on these results gamma irradiation and UV-C treatment possess the potential to replace conventionally used hot water treatment in mango.
  Qaisar Abbas , Ijaz Ahmad , Muhammad Asghar Shahid , Muhammad Faheem Akhtar , Mussurat Hussain , Muhammad Akram and Ali Raza
  A field study was carried out to determine the role of weather factors on canola aphids population. Aim of this study was to investigate, how meteorological factors play a role in fluctuating aphid population. The experiment was conducted on canola crop grown under three farming systems i.e., synthetic fertilizer, farm yard manure and untreated control. Aphid population was recorded from 1st week of February to 2nd week of March during 2009 and 2010 and weather data was collected from metrological observatory during the same period. The results revealed that a peak aphid population was recorded during the beginning of 2nd week of March in both years of the study. Aphid density was positively associated with maximum as well as minimum temperature while it showed a negative correlation with relative humidity. The rainfall during 2009 showed significant and negative correlation with aphid population while during 2nd year of studies (2010) it showed non significant correlation. On division of aphid infestation period into different phases of infestation, it was observed that during the establishment phase, the rainfall and relative humidity were negatively correlated, whereas, temperature was positively correlated while, during the declining phase temperature had negative relationship with aphid population build up.
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