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Search Results: 1 - 10 of 1896 matches for " Amjad Iqbal "
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Genetic behavior and impact of various quantitative traits on oil contents in sunflower under waters stress conditions at productive phase
Mudassar Iqbal,M. Amjad Ali,Amjad Abbas,M. Zulkiffal
Plant Omics , 2009,
Abstract: The research pertaining to the genetic behavior and impact of various quantitative traits on oil contents in sunflower under water stress conditions at reproductive stage in ten accessions (G-5 G-3, G-9, G-33, G-57, G-93, G-128, A-133, A-75 and HBRS-2) of sunflower was conducted following a triplicate randomized complete block design. The genotypes exhibited significant varietal differences among them for all the characters studied. Whorls per head (0.53) and number of leaves (0.66) displayed highest genotypic and phenotypic coefficients of variation respectively. Heritability in broad sense was the maximum for oil contents (0.715±0.346) followed by achene yield per plant (0.499±0.289) with considerable values of genetic advances indicating the involvement of some additive effects in the inheritance of these traits. Total leaf area exhibited the uppermost value of genetic advance (77.088) with moderate heritability (45±2.76). Plant height showed positive and significant genotypic association with leaf area and achene yield. Similarly number of leaves displayed positive and significant correlation (r=0.727*) with total leaf area and oil contents at genotypic level. The parameters stem diameter, head diameter, whorls per head and fertile whorls per head demonstrated positive and significant genotypic and phenotypic relationship between them. The number of whorls per head disclosed positive genetic association (r=0.625*) with oil contents while oil contents were negative associated with hundred achene weight (r= -0.768*). Path analysis based on oil content as dependent variable revealed that number of leaves, total leaf area, stem diameter and achene yield exerted positive direct effects on the oil contents being stem diameter at the top of the list. Stem diameter exposed the highest indirect positive effects on oil contents through head diameter, whorls per head and fertile whorls per head. These studies revealed that the selection of traits positively associated with oil contents and having positive direct and indirect effects on it could be an efficient selection criteria for oil contents in sunflower.
NEW APOPTOTIC EFFECT OF D-MANNOSE IN WHEAT ROOTS
AMJAD HAMEED,NAYYER IQBAL,SALMAN A. MALIK
Pakistan Journal of Botany , 2008,
Abstract: Effect of D-mannose on antioxidant defense response, apoptotic internucleosomal nuclear DNA (nDNA) degradation, and protease activity was studied in roots of wheat seedlings during early growth. Mannose (1%) induced apoptotic internucleosomal nDNA fragmentation after 96 hours of treatment when it was not observed in control. Superoxide dismutase activity was down regulated parallel to induction of apoptosis. Protease activity was enhanced prior to induction of apoptosis which shows involvement of proteolysis in apoptotic induction process. More over a sharp increase in membrane lipid peroxidation (MDA content) was also observed during apoptosis induction. Catalase and peroxidase activities were increased 24 hours before apoptotic induction while down regulated at time of induction. Total phenolic content was down regulated 48 hours before induction of apoptosis. Collectivity antioxidant defense was down regulated and proteases activities and lipid peroxidation were enhanced during induction of apoptosis and thus play a key role in controlling D-mannose induced apoptotic process. New apoptotic effect of D-mannose in wheat roots in connection with antioxidants and proteases activities is discussed in detail.
Chemical Characteristics of Drinking Water of Peshawar
Amjad Ali Bacha,Mohammad Illyas Durrani,Parveez Iqbal Paracha
Pakistan Journal of Nutrition , 2010,
Abstract: Ninety drinking water samples of fifteen each from three urban and three rural areas of Peshawar were collected and analyzed for their heavy metals, minerals, SO4, NO3 and Cl. In the urban area were Hayatabad, City and Sadder while from rural area Shikhmohamadi, Palosi and Jagra. Among the heavy metals and minerals Pb, Cr, Fe, Zn, Mn, Ca, Cu and Mg were determined by atomic absorption spectrophotometer, Na and K by flame photometer, Cl by titration method, SO4 by spectrophotometer and NO3 by nitrogen analyzer. The mean value of Pb, Cr, Fe, Zn, Cu and Mn among different locations were, 0.15±0.11, 0.21±0.05, 0.68±0.15, 0.09±0.14, 0.11±0.03 and 0.01±0.01 mg/L respectively. The mean value of Na, Mg, K and Ca were 26.61±3.70, 23.47±4.24, 3.11±1.77 and 40.96±16.94 mg/L respectively. For SO4, NO3 and Cl mean value 12±6.54, 5±1.26 mg/L and 14±4.90 mg/L respectively. Minerals content result obtained indicated that their level in different locations were in safe level as recommended by WHO and for heavy metals they are above the safe limit as recommended by WHO. Hence considered unfit for drinking purpose and it was concluded that the water from Peshawar region should be checked and monitored regularly in order to omit all possible sources of contamination or to reduce it.
Physical and Bacteriological Characteristics of Drinking Water of Peshawar
Amjad Ali Bacha,Mohammad Illyas Durrani,Parveez Iqbal Paracha
Pakistan Journal of Nutrition , 2010,
Abstract: Ninety drinking water samples of fifteen each from three urban and three rural areas of Peshawar were collected and analyzed for their pH, Electrical Conductivity (EC), turbidity, coliform and E. coli were determined for bacteriological assessment and its quality. In the urban area were Hayatabad, City and Sadder while from rural area Shikhmohamadi, Palosi and Jagra. Coliform and E. coli were by Most Probable Number (MPN) and Ejakman method respectively. pH, EC and turbidity mean value were 7.44±0.16, 0.64±0.08 μscm-1, 0.88±0.77 FTU respectively. Total Coliform ranged from 0.00-150.00 with mean value of 37.79, while E. coli was present (+ve) in 26% sample and absent (-ve ) in 74% drinking water sample. All the physical parameters were in the safe limit recommended by WHO. Hence considered unfit for drinking purpose and it was concluded that the water from Peshawar region should be checked and monitored regularly in order to omit all possible sources of contamination or to reduce it.
Pharmacokinetics of Ofloxacin in Male Volunteers Following Oral Administration
Amjad Hameed,Tahira Iqbal,Muhammad Nawaz,Faiz Batool
Pakistan Journal of Biological Sciences , 2002,
Abstract: Ofloxacin a synthetic fluorinated analog of nalidixic acid is broad spectrum antibiotic. This study was designed to find pharmacokinetics of ofloxacin in healthy male volunteers under indigenous conditions. A total of 15 healthy male volunteers were included in this study. Ofloxacin (200 mg) was administered orally and blood samples were collected at different time intervals. The blood samples were analyzed for drug concentration by microbiological assay. The plasma concentration verses times data was used to determine pharmacokinetics parameters by one compartment model kinetic analysis. The mean (SD) values for different parameters were, absorption rate constant (Ka) 7.833 (8.683) l h -1, area under curve (AUC) 14.545 (4.304) h, mg l -1, total body clearance (CI) 14.913 (4.373) l h -1, volume of distribution (Vd) 130.76 (25.598) l, elimination half life (t1/2 ) 6.419 (1.789) h, elimination rate constant (k10 ) 0.154 (0.139) l h -1, mean residence time (MRT) 10.104 (2.384) h, absorption half life (t1/2α ) 0.212 (0.151) h, time to maximum concentration (tmax) 1.397 (0.599) h and maximum concentration (Cmax) 1.416 (0.305)micro grams ml -1. Values of parameters like Vd, AUC and Cl were comparable with foreign studies. While t1/2β , Ka were higher, and C max , tmax were lower in local population as compared with the foreign studies.
Examining the Relationship of Work-Life Conflict and Employee Performance (A Case from NADRA Pakistan)
Amjad Ali Chaudhry,Muhammad Imran Malik,Iqbal Ahmad
International Journal of Business and Management , 2011, DOI: 10.5539/ijbm.v6n10p170
Abstract: With the ever increasing requirements of the work, employees are likely to develop conflict between their work and non-work activities. This paper investigates the relationship of employees’ work-life conflict with their performance. A convenient sample of 103 respondents came from National Database and Registration Authority (NADRA) for the study. The Pearson’s product moment correlation showed no association for the said relationship. An inverse relationship was found working between age of the employees and work-life conflict they experience. Moreover differences of work-life conflict and performance for some demographic variables were measured by applying independent sample t test. The results of the study are compared to the available relevant studies.
Influence of Hydrogen Peroxide on Initial Leaf and Coleoptile Growth in Etiolated Wheat (Triticum aestivum L) Seedlings
Amjad Hameed,Salman Akbar Malik,Nayyer Iqbal,Rubina Arshad
Asian Journal of Plant Sciences , 2003,
Abstract: Influence of oxidative stress induced by exogenous application of hydrogen peroxide on initial leaf and coleoptile growth in etiolated wheat seedlings was studied. Leaf and coleoptile growth parameters (mean fresh weight and length) showed a transient stress effect during very initial age, becoming non-significant (P>0.05) in later age (8th day). Mean leaf fresh weight increased steadily after 5th day in both stressed and control seedlings, however the magnitude was lower in stressed seedlings and the difference was non-significant (p>0.05). Mean coleoptile fresh weight was significantly (p<0.01) lower in stressed seedlings on all days except on 6th and 8th day where the difference was non-significant (p>0.05). Mean leaf and coleoptile length were significantly (p<0.01) lower in stressed seedlings during 5 to 7th day, however the difference was non-significant (p>0.05) on 8th day. Stress effect was more pronounced on 5th day in case of leaf and coleoptile length and coleoptile fresh weight. Collectively oxidative stress induced by exogenous application of hydrogen peroxide induces a transient and finally a non-significant effect on initial leaf and coleoptile growth, which indicated the adaptation of seedlings to applied stress.
ROUTING TECHNIQUES IN COGNITIVE RADIO NETWORKS: A SURVEY
Amjad Ali,Muddesar Iqbal,Adeel Baig,Xingheng Wang
International Journal of Wireless & Mobile Networks , 2011,
Abstract: Cognitive Radio Networks (CRNs) are being studied intensively. The major motivation for this is theheavily underutilized frequency spectrum. CRN has the capability to utilize the unutilized frequencyspectrum. Routing in CRN is a challenging task due the diversity in the available channels and data rates.In this paper, we present a survey of the state-of-the-art routing techniques in CRNs. We first outline thedesign challenges for routing protocols in CRNs followed by a comprehensive survey of different routingtechniques. Furthermore we classified these routing protocols into spectrum aware-based, multipathbased,local coordination-based, reactive source-based and tree-based routing techniques depending onthe protocol operation.
Multi-Path Routing and Channel Assignment Framework for Mesh Cognitive Radio Network (MRCAMC)
Amjad Ali,Muddesar Iqbal,Adeel Baig,Xingheng Wang
International Journal of Wireless & Mobile Networks , 2011,
Abstract: Dynamic spectrum access is an attractive area of research these days. Cognitive Radio (CR) enabled networks are being deployed to effectively utilize the RF spectrum. Wireless mesh networks have been experiencing the bandwidth scarcity but such networks can easily enhance their throughput by using theCR transceivers as these networks have the capability of multipath routing. Existing routing proposalsfor Mesh Cognitive Radio Networks (MCRNs) are not considering the dynamic spectrum availability. They try to treat CRNs as traditional wireless networks. Even some proposals treat the problems of these networks like that of wired networks and use the same parameter for route discovery as for wired networks. In this paper, we propose a joint interaction between on-demand routing and channel assignment that accounts the characteristics of CRNs.
Biodisposition Kinetics of Ofloxacin in Pakistani Healthy Female Volunteers after Oral Administration
Amjad Hameed,Faiz Batool,Tahira Iqbal,Tayyba Tabassum Baig
Journal of Biological Sciences , 2002,
Abstract: This study was based on biodisposition kinetics of ofloxacin in Pakistani healthy female volunteers after oral administration. Ten healthy female volunteers were included in this study. The blood samples of each volunteer were collected after oral administration of ofloxacin. The concentration of ofloxacin in blood samples was measured by microbiological assay. The mean (SE) values of time to peak (tmax), peak concentration (Cmax), absorption half life (t1/2α), absorption rate constant (ka), elimination half life (t1/2), elimination rate constant (K10β), were 1.012 ± 0.176 h, 0.907 ± 0.126 μg ml-1, 0.516? 0.093h, 13.593?2.936L h-1, 2.996 ± 0.567h and 0.291 ± 0.693 L h-1 respectively. The mean (SE) values for area under curve (AUC), clearance (CL), volume of distribution (Vd) and mean resident time (MRT) were 4.358 ± 0.771 h.mg-1 1itter, 53.470 ± 11.068 l h-1, 214.41?49.127 litter and 5.030 ± 0.705 h respectively. Values of parameters like, volume of distribution, total body clearance and absorption rate constant were higher, while elimination half life, AUC, Cmax, and tmax were lower in local population as compared with foreign studies. There was no influence of body surface area on total body clearance of ofloxacin (R2=0.0581). There was an increase in body clearance of ofloxacin (R2=0.2236) and area under curve (AUC) for ofloxacin (R2=0.258) with increasing body surface are of volunteers. Therefore body surface area of volunteers may slightly influence the total body clearance and area under curve for ofloxacin. These gender-related differences mainly low body weight and surface area in females may warrant dosage adjustments.
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