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Search Results: 1 - 10 of 798 matches for " Athar Nadeem "
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Impact of Seed Treatment with Systemic Insecticides on Cotton Leaf Curl Disease
Tariq Mehmood,Athar Nadeem,Merritt R Nelson
Pakistan Journal of Biological Sciences , 2001,
Abstract: Field studies were conducted to assess the effect of seed dressing systemic insecticides on cotton leaf curl disease (CLCuD) and their impact on yield components. Spread of disease and severity was comparatively lower in treated plots than untreated control. Plants grew more vigorously in imidacloprid followed by thiamethoxam treatments. Seed treatment with imidacloprid proved to be the best. Average number of bolls per plant were 16 in imidacloprid treated plots followed by 12 in thiamethoxam treated plot and 10 in non-treated control. Other yield components were also more in treated plots than untreated control. The yield was estimated to be 80% more in imidacloprid treated plot and 18% in thiamethoxam treated plot over control.
Induction of Mild Strains of Pepper Mottle Virus by Chemical Mutagenesis and Their Efficacy in Cross Protection
Athar Nadeem,Zhongguo Xiong,Merritt Nelson
Pakistan Journal of Biological Sciences , 1999,
Abstract: The present study was conducted to test the effectiveness of nitrous acid induced mutants of PeMV in cross protection. Crude sap of pepper Capsicum frutescens L. `NM 6-4` infected with pepper mottle virus (PeMV) was treated with nitrous acid to induce mutants. Twelve isolates were selected from two distinct types of local lesions produced by nitrous acid treatment on Capsicum frutescens L. `tabasco`. Of the twelve isolates, five induced mild symptoms on both pepper foliage and fruit. When these mild isolates were inoculated to pepper plants and subsequently challenged with the wild type PeMV, they protected the plants from the severe effect of the wild type isolate. One hundred percent of marketable pepper fruit was produced from these protected plants.
Cotton Leaf Curl Disease: Measuring and Analyzing its Epidemics Using GIS
Athar Nadeem,Merritt R. Nelson,Thomas V. Orum,Ijaz Parvez
Pakistan Journal of Biological Sciences , 2001,
Abstract: Cotton leaf curl disease occurred throughout the province of Punjab during the year 1996, but there were patches where it was less severe and other patches where it was very severe. Nine varieties were planted in Mian Channun project area. CIM-240 was predominant variety through out cotton growing region of the Punjab There were varietal differences in both incidence and severity. To eliminate the possibility of varietal effects on the spatial pattern, kriging was done with only those fields planted with CIM-240. There were not enough points to give a broad coverage of the area, but the basic spatial pattern of incidence was the same as when all varieties except CIM-1100 are included in the analysis. Any influence of variety was evidently randomly distributed across the landscape so that the spatial pattern of the disease on CIM-240 was similar to the spatial pattern on all the varieties combined. This might not always be so in years when there are strong regional differences in the selection of varieties. There was a strong correlation (r = 0.962) between incidence and severity and the spatial pattern of severity was quite similar to that of incidence.
Effect of NaCl Salinity on Growth, Nodulation and Total Nitrogen Content in Sesbania Sesban
A. Mahmood,Mohammad Athar,Raiha Qadri,Nadeem Mahmood
Agriculturae Conspectus Scientificus (ACS) , 2008,
Abstract: A pot experiment was conducted to determine the effect of salinity on growth nodulation and nitrogen content of Sesbania sesban. Fifteen days old S. sesban seedlings grown in sandy loam soil were irrigated with NaCl solution of 0.034 mol/L, 0.069 mol/L, 0.103 mol/L, 0.137 mol/L and 0.172 mol/L. The plants were harvested after 80 days. Fresh and dry weight of shoots and roots and root- shoot ratio decreased progressively with the increasing salinity levels. Root showed more inhibition than shoot. Nodules were observed on the roots of plants growing in all fi ve salinity levels but they showed morphological alterations in size and shape. The number and size of the nodules per plant and their fresh and dry weight decreased with increasing salinity levels. The percentage of tissue nitrogen also decreased progressively with the increasing salinity levels.
Effects of Seawater Salinity on Seedling Growth Nodulation and Tissue Nitrogen in Acacia nilotica (L.) Delile
Ahmad Mahmood,Mohammad Athar,M. Afzal Siddique,Nadeem Mahmood
Agriculturae Conspectus Scientificus (ACS) , 2012,
Abstract: A pot experiment was conducted to determine the effect of sea water salinity on growth, nodulation and nitrogen content of Acacia nilotica (L.) Delile seedlings. Eight weeks old seedlings were irrigated with 40, 50, 60, 70 and 80% sea water for one month. After 12 weeks the plants were uprooted and the nodules were observed for their frequency, shapes and sizes. Nodules showed morphological alterations in size and shape in different salinity levels. The root-shoot ratio, nitrogen contents in the leaf, stem and root were analyzed. In general salt stress resulted in a decrease of plant growth, nodulation and percent tissue nitrogen in A. nilotica plants. Root-shoot ratio showed gradual increase with increasing sea water concentrations. Nitrogen contents decreased in leaf and stem, whereas it increased in roots. Nodules showed morphological alterations in size and shape with increasing salinity. A. nilotica accumulated NaCl in the xylem of the roots that may be considered as a preliminary salt tolerant mechanism adopted by the plant.
Comparative Within Field Dispersal Patterns of Aphid and Whitefly Transmitted Viruses
Thomas V. Orum,Athar Nadeem,Larry J.Stowell,Merritt R. Nelson
Journal of Biological Sciences , 2001,
Abstract: Within field dispersal characteristics of an aphid-transmitted potyvirus (water melon mosaic 2) and a whitefly transmitted geminivirus (cotton leaf crumple) were compared. Despite differences in the virus, the insect vector and the host plant, within-field patterns of infection were similar for both systems studied at two spatial scales. Ordinary runs analysis and sample variogram analysis of individual plant data suggest plant to plant spread within rows over a range of 3 to 5 plants (0.5 to 2.5 m) and variogram analysis of quadrats suggests spatial structure (non-random spatial patterns) of incidence over a range greater than 15 meters. Sample variogram values in the direction perpendicular to row orientation (north-south) were higher than sample variogram values in the direction of row orientation (east-west) at both scales in both virus/vector/host systems. These observations are consistent with spread of the virus occurring faster within rows than between rows in a field.
Intelligent High Resolution Satellite/Aerial Imagery  [PDF]
Nadeem Fareed
Advances in Remote Sensing (ARS) , 2014, DOI: 10.4236/ars.2014.31001
Abstract:


High resolution satellite images are rich source of geospatial information. Nowadays, these images contain finest spectral and spatial information of ground realities in different electromagnetic spectrum. Many image processing softwares, algorithms and techniques are available to extract such information from these images. Multi spectral as well as panchromatic (PAN) high resolution satellite images are missing, one important information, regarding ground features and realities that information is attribute information which is not directly available in high resolution satellite images. From very first day, this information used to be collected through indirect ways using GPS, digitizing, geo-coding, geo tagging, field survey and many other techniques. Our real world has vertical labels for ground observer to identify and use this information. These vertical labels are present in form of names, logos, icons, symbols and numbers. These vertical labels ease us to work in real world. Satellites are unable to read these labels due to their vertical orientation. Making satellite/aerial imagery rich of attribute information, we have the possibility to design our world accordingly. Just like vertical labels we can also place real physical horizontal label for space sensors, to make this information directly available in high resolution satellite/aerial imagery. This work is about possibilities of such techniques and methods.



Bonded Labour in Pakistan  [PDF]
Nadeem Malik
Advances in Anthropology (AA) , 2016, DOI: 10.4236/aa.2016.64012
Abstract: Bonded labour is widespread in Pakistan. This paper is an attempt to illustrate the nature of bonded labour in the agricultural sector and the brick kiln industry in the country. Despite the introduction of Bonded Labour System (Abolition) Act 1992, bonded labour thrives because of the power and influence of big landlords in rural and factory owners in urban localities. It is argued that without effective land reforms or land distribution bonded labour cannot be eliminated. In additional to land reforms, effective governance based on strong democratic culture free of the influence of big landowners is essential to address the issue of bonded labour in Pakistan.
Hydrothermally Synthesized NanobioMOFs, Evaluated by Photocatalytic Hydrogen Generation  [PDF]
Tabinda Sattar, Muhammad Athar
Modern Research in Catalysis (MRC) , 2017, DOI: 10.4236/mrc.2017.62007
Abstract: Three new materials, nanobioMOFs (cobalt argeninate, cobalt asparaginate and cobalt glutaminate) have been hydrothermally synthesized. Nano sized morphology of all these materials have been obtained by scanning electron microscopic technique. Mass spectrometric studies of all these materials have been conducted for determination of their molar masses. All these nanobioMOFs have been found to exhibit photocatalytic hydrogen generation in pure water upon irradiation at wavelengths longer than 650 nm. The amounts of quantum yield of hydrogen generation at 650 nm in water was 4.5%, 4.0% and 3.5% for cobalt argeninate, cobalt asparaginate and cobalt glutaminate respectively. The apparently higher yield of hydrogen generation from these amine functionalized nanobioMOFs can direct to the development of more nano sized functionalized MOFs for water splitting.
Timed-Automata Based Model-Checking of a Multi-Agent System: A Case Study  [PDF]
Nadeem Akhtar, Muhammad Nauman
Journal of Software Engineering and Applications (JSEA) , 2015, DOI: 10.4236/jsea.2015.82006
Abstract: A multi-agent based transport system is modeled by timed automata model extended with clock variables. The correctness properties of safety and liveness of this model are verified by timed automata based UPPAAL. Agents have a degree of control on their own actions, have their own threads of control, and under some circumstances they are also able to take decisions. Therefore they are autonomous. The multi-agent system is modeled as a network of timed automata based agents supported by clock variables. The representation of agent requirements based on mathematics is helpful in precise and unambiguous specifications, thereby ensuring correctness. This formal representation of requirements provides a way for logical reasoning about the artifacts produced. We can be systematic and precise in assessing correctness by rigorously specifying the functional requirements.
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