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Articles by Talat Mahmood
Total Records ( 6 ) for Talat Mahmood
  Talat Mahmood and Syed Sadaqat Mehdi
  Genotypic and phenotypic correlation coefficients in 150 each S1 and S2 progenies of sunflower derived from random mated sunflower UAF population were studied. The estimates of genetic correlation coefficients were found greater in value than the phenotypic correlation coefficients for all the indicated traits for both S1 and S2 progenies of sunflower. Among S1 progenies of sunflower, seed yield was found positively and significantly correlated with all the traits studied at both phenotypic and genetic levels except with oil content which was positive but non-significant, at genetic level. Oil yield also showed positive and significant correlation with all the traits both at phenotypic and genetic levels but oil content showed positive and significant correlation with days to flowering, days to maturity, internodal length and 100-achene weight at phenotypic level and with days to flowering, days to maturity and 100-achene weight at genetic level. Among S2 progenies of sunflower seed yield also showed almost similar results as of S1 progenies. Among S1 progenies, internal disease score was found positively but non significantly correlated with all the indicated traits at both phenotypic and genetic levels except head diameter which was found negatively correlated at phenotypic and genetic levels. Among S2 progenies, internal disease score showed positive and significant correlation with most of the traits showing that S2 progenies have more resistance to charcoal rot than S, progenies.
  Talat Mahmood and Syed Sadaqat Mehdi
  Mean squares from analysis of variance revealed significant differences among S1 and S2 progenies evaluated for seed yield, its components and resistance to charcoal rot disease. Mean, range and coefficient of variation indicated that S1 and S2 progenies of "UAF" random mated sunflower population contained larger amounts of variability for all traits. The estimates of genotypic variance were smaller than their corresponding phenotypic variances, revealing presence of environmental components. The genotypic variances among S1 and S2 progenies were significant for all the traits evaluated by testing with their respective standard error. The estimates of environmental variances for indicated traits among S1 and S2 progenies remained low in value compared to their respective genotypic and phenotypic variances. The estimates of broad-sense heritability for all the traits evaluated were comparatively greater among S2 progenies. However, the heritability of all plant traits when tested with their respective standard error when found to be significant for both S1 and S2 progenies.
  Kashif Hussain , Tariq Masud , S. Maqsud and Talat Mahmood
  For the production of yogurt and related products, the local and the commercial yogurt manufacturers of Pakistan are still, by and large using an undefined, unclassified mixture of lactic acid bacteria together with a large number of contaminated strains. Phages isolated in our part of world show different characteristics in terms of phage morphology, lytic patterns and burst size etc, compared to phages isolated elsewhere in the world cause serious problems to fermentation process and ultimate economic losses to dairy industry. In order to develop indigenous resistant starter cultures phages were isolated from samples of Dahi whey isolated phages were characterized on the basis of host range, latent period and burst size. Five virulent phages KT-1, KT-2, KT-3, KT-4 and KT-5 were isolated from twelve samples of whey using Lactococcus lactis strains as host. These phages caused lysis and ultimately retarded acid production of host strains. Three phages i.e. KT-1, KT-2 and KT-3 have shown multiple host specificity. Phages KT-1 and KT-2 have same latent period of 15 minutes but exhibited a slightly different rise period that is 20 minutes and 25 minutes respectively, the burst size of 90 and 65 phages per cell were detected for KT-1 and KT-2 respectively. KT-4 showed burst size of 80 phages per infected cell, whereas KT-5 showed burst size of 90 phages per cell. The results reveal that bacteriophages from this region are different from phages isolated in other parts of world.
  Syed Tariq Mehmood , Tariq Masud , Talat Mahmood and S. Maqsud
  Yoghurt is the most popular fermented milk product in the most parts of world. It involves use of specific symbiotic culture of L. bulgaricus and S. thermophilus. Yoghurt consists of valuable nutrients as in milk but it seems to have more than milk. In the present study different food additives from local source are used as additives and the effect is estimated for possible influence on the quality of yoghurt. Yoghurt was prepared by using different stabilizers like carboxymethyl-cellulose (CMC), guar gum, gelatin, cornstarch and their combinations like CMC-gelatin, gelatin-cornstarch and CMC-cornstarch at different levels i.e. 0.1, 0.2, 0.3, 0.4 and 0.5% at 0, 7, 14 and 21 day of storage interval. Guar gum at 0.1% gives best result for low acidity and low pH where as total solid free fatty acid, acetaldehyde contents comes best with the cornstarch. Food additives have influence on pH, acidity, total solid and acetaldehyde contents. During the storage of 21 days with increasing amounts of food additives, there was an increase in acidity, free fatty acids, total solid and acetaldehyde contents but decrease in pH.
  Talat Mahmood , Tabassum Hameed , Nouman Rashid Siddiqui , Amir Mumtaz , Naeem Safdar and Tariq Masud
  Wheat (Triticum aestivum) is one of the most important food grain crops in all South Asian countries especially in India and Pakistan. These countries have diversifying soil and climatic conditions inserting measurable effect on nutritional as well as anti-nutritional parameters of wheat. Wheat varieties included in this study are collected from different agro-ecological zones of Pakistan. Myoinositol hexa-phosphate (phytic acid) one of major anti-nutritional factors wheat. Phytic acid of collected samples was determined to facilitate the crop breeders and agronomists, so that they would also consider this factor while conducting research works. It was observed that wheat varieties showed different levels of phytic acid at different locations. At one location (Islamabad), a variety (Pari-73) showed the highest value of Phytic acid (1.343%) and at other location (Faisalabad), same variety the showed lowest phytic acid (0.74%). This maximum variability (44%) also indicated that there was significant effect of change in location on phytic acid contents of wheat varieties. It is mainly due to presence of available phosphorus reserves in soil as phytate has direct relation to soil phosphorus.
  Sartaj Ali , Tariq Masud , Kashif S. Abbasi , Talat Mahmood and Ijlal Hussain
  Fresh fruits are increasingly focused in the recent years for their nutritional and health benefits. Research involving simple and safe preservation technologies is at a high demand to satisfy consumer concerns and harvest maximum market potential. The present study was therefore undertaken to assess the response of chemical and bioactive compounds (pH, acidity, ascorbic acid, total phenolics, carotenoids, free radical scavenging capacity and enzyme activity) in apricot under the effect of calcium treatments (1, 2, 3 and 4%) at ambient storage. The results revealed that ascorbic acid, phenolic compounds and carotenoids were least affected in 3 and 2% calcium as compared to control, 1 and 4% CaCl2. Similarly, higher antioxidant capacity and lower enzymatic activity was retained in the same concentrations. Titratable acidity and ascorbic acid decreased in all treatments during storage and higher reduction was observed in control, 1 and 4% as compared to 3 and 2% calcium, respectively. pH, phenolics, carotenoids, antioxidant and enzymatic activity increased initially and it was rapid up to 6th day, followed by a slight decrease during subsequent storage. The overall results demonstrated higher compositional losses in control followed by 1 and 4% calcium treated fruits, while 3 and 2% treatments exerted pronounced effects on keeping quality of apricot during ambient storage up to 12th day.
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