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Articles by S. Shahid Shaukat
Total Records ( 6 ) for S. Shahid Shaukat
  Imran Hashmi , S. Shahid Shaukat , Moazzam Ali Khan and M. Altaf Khan
  The biosimulator system (activated sludge system) have proved to be very effective in the treatment of wastewater containing high content of pesticide and Chemical Oxygen Demand (COD) in terms of organic load and the quality of effluent being obtained after treatment was acceptable for landscape irrigation and for growing plants of ornamental value for commercial use. The biosimulator can be operated without being an aesthetic nuisance at a considerably low Dissolved Oxygen (DO). The efficiency of the biosimulator at high organic load (pesticide inobulated) and the inoculation of strain of Pseudomonas capable of degrading malathion, could be used to minimize time for treating wastewater containing high content of hazardous pesticide.The principal component analysis exposed the groups of correlated variables and their importance in the data structure. MalIN -MalOUT, TMC, MalOUT/MalIN and CODOUT/CODIN were highly correlated with each other and emerged as the variables controlling the first component. DO, pH and retention time governed the second component. The third component of PCA essentially repeated the trend exhibited by the first two components. The presence of pesticides or their metabolites, emphasizes the need for conducting monitoring studies, in order to draw a national picture for overall assessment of the situation.
  Nazia Burhan and S. Shahid Shaukat
  Effect of Argemone mexicana L. on seed germination and early seedling growth of six crop species was investigated. Aqueous extract of A. mexicana inhibited germination, root and shoot growth of all the test species. The species showed differential response. Germination was reduced by the aqueous shoot extract in the order: pearl-millet > mustard > wheat> carrot> corn > turnip. Root length was reduced in the order:corn> pearl-millet> wheat > mustard > turnip> carrot, whereas shoot length was reduced in the order: pearl-millet> wheat> corn > turnip> mustard > carrot. Decaying A. mexicana in sandy loam soil at a rate of 5,10,20 g / 400 g soil substantialy inhibited germination and seedling growth of pearl-millet. Bioassay of the extract of A. mexicana revealed three phenolic inhibitors and paper chromatography revealed the presence of p-hydroxybenzoic, vanillic and salicylic acids.
  Raees Hussain Zaidi , S. Shahid Shaukat and Shaheen Abidi
  A tropical insect community was analyzed from March to August, 1990. The observed abundance pattern usually did not fit MacArthur's broken stick model. Species diversity (H’) was highest in June and July (1.0236, 1.0290 and 1.01162) and lowest in April and May (0.8078 and 0.8281). Agglomerative cluster analysis showed two groups of samples with the exception of samples collected in May. First group consisted of March to April samples and 2nd group had the samples of May to August. This clustering revealed that community changes were correlated with the environmental factors i.e. humidity, temperature and rainfall.
  Rufus. S. A. Gill and S. Shahid Shaukat
  The Fungicide Captan was screened in Allium cepa multiple assay test for mutagenic activity. Actively dividing root tips were treated with four different concectrations 5, 10, 20 and 40 ppm of the fungicide for 1, 3, 6, 12 and 24 hours. Almost all trearments exerted a mitodepressive action indicating that the fungicide has an immediate effect on cell division . It was noted that the fungicide exerts a clastogenic effect on chromosomes. Mitotic aberrations observed included stickiness of chromosomes at prophase, metaphase, bridging at anaphase and bi and tri nucleated cells. Such aberrations are important as they may have evolutionary significance.
  Imran Ali Siddiqui , Amer- Zareen and S. Shahid Shaukat
  Cytotoxic activity of six fungi namely Aspergillus niger. A. terreus, A. nidulans, Trichocierma harnatum, Fusarium pallicioroseam and Alterrierla alternate was tested using Brine shrimp bioassay. Pure culture filtrates of A. niger and F. pallidoroseum caused 100 percent mortality of Brine shrimp larvae within 24 h while rest of the filtrates caused >30% mortality. Boiling the filtrates retained their cytotoxicity suggesting that the active compounds were thermostable. Water-soluble fraction of A. niger was much more cytotoxic (LC50 31 μg/ml) compared to ethyl acetate LC50 = 663 μg/ml) and hexane extract (LC50 = 981 μg/ml). These results are discussed with respect to their pharmacological utility.
  S. Shahid Shaukat , Imran Ali Siddiqui , Zarina Ali and Maria Hamid
  The investigation focuses on competitive interactions between individuals of the perennial shrub Ziziphus nummularia and the annual herb Rhychosia minima with the aid of nearest-neighbour analysis in a sub-tropical desert region. Both intraspecific and interspecific competitive interactions were detected between nearest-neighbouring pairs. The cover as well as reproductive potential of R. minima were significantly reduced when it established in the close vicinity of Z. nummularia.
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