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Articles by T.M. Ansari
Total Records ( 4 ) for T.M. Ansari
  M.A. Malana , M. Ahmad , T.M. Ansari , S.S.R. Naqvi and M. Ali
  In the present work, quality of twelve commercial gear oil brands has been assessed by evaluating the physical characteristics and phosphorus contents. Physical parameters (Flash point, Pour Point, Viscosity index and Kinematic viscosity) and phosphorus contents were determined by standard test methods recommended by the American Society for Testing and Material (ASTM). Evaluated parameters have been compared with PSI standard specifications and the manufacturers specifications. Results indicate that none of the gear oil samples satisfy fully PSI standard test limits specified for Extreme Pressure Grade gear oils. Only a few samples have fulfilled the specifications given by the manufacturers. Marketing of sub-standard gear oil products in Pakistan is an alarming situation. Government of Pakistan should take strict measures to improve the quality of gear oils widely used in sophisticated machines.
  M. Ashraf , Zafar Iqbal Zafar , T.M. Ansari and Fiaz Ahmad
  In the present study, reaction kinetics was carried out using low grade calcareous phosphate rock particles in dilute phosphoric solution. To study the reaction parameters a number of experiments were carried out in a glass reactor column. The results indicate that the selective leaching of the calcareous material in the rock is controlled by the fluid layer depending on the reaction conditions. The results also show that the value of reaction rate constant does not appear to be a strong function of the particle size while the value of mass transfer coefficient increases with an increase in particle size.
  K.F. Akbar , Z. Ahmad , M.A. Shad and T.M. Ansari
  The present study was carried out to investigate the floristic composition of roadside vegetation and levels of some heavy metals in roadside soils in Sahiwal district, Pakistan. Among sixty recorded species, the main grass species include Cynodon dactylon, Desmostachya bipinnata, Panicum turgidum, Cyperus rotundus and Cenchrus biflorus. The dominant species exhibited little variation between different zones of verges. Other species however, showed preferences for certain zones of the verges indicating differences in microhabitat conditions in the verges. The roadside soils were analysed for lead, copper, manganese and zinc levels. The amount of total lead, zinc, copper and manganese varied from 0.5 to 48.4, 37.7 to 109.9, 3.8 to 44.3 and 170 to 258.5 μ g g-1, respectively with a mean values of 9.4, 63.0, 31.4 and 218 μ g g-1. The levels of heavy metals in the roadside soils indicated that these soils were non-contaminated.
  T.M. Ansari , N. Ikram , M. Najam-ul-Haq , I. Fayyaz , Q. Fayyaz , I. Ghafoor and N. Khalid
  In this study, concentrations of four essential trace metals, i.e., zinc, manganese, copper and iron have been estimated in thirty five different spices and plants having folk medicinal uses. A wet digestion procedure involving the use of aqua regia (HNO3: HCl 1:3) has been used to solubilize metals from the plant samples. Flame atomic absorption spectrometry has been used to quantify metal levels. Results indicate the presence of variable amounts of metals in these plant samples. Order of concentration of metals in different spices and medicinal plants has been found to be as: Fe>Mn>Zn>Cu. Plant samples of Black Caraway (Cuminum nigrium), Cassia (Cassia fistula),Coriander(Coriandrum sativum),Chicory(Cichorium intybus),Castor(Ricinus communis), Basil(Ocimum basilicum),Small Cardamom (Elettaria cardamomum),Bishop`s weed(Trachyspermum ammi),Musli(Aneilema Scapiflorum),Black cumin(Nigella sativa),Sensitive plant(Mimosa pudica),Water chestnut(Trapa bispinosa),Chaksu(Cassia absus)and Nuts-cooling(Wathania coagulans) contained comparatively higher amounts of zinc (i.e. > 50 μg g ha-1 ) whereas clove (Syzgium aromaticum), Large cardamom (Amomum subulatum), Black pepper (Pepper nigrium), Cinnamon (Cinnamomum zeylanicum), Basil (Ocimum basilicum), Small Cardamom (Elettarai cardamomum), Fennel (Foeniculum vulgare), Syrian rue (Peganum harmala), Ginger (Zingiber officinale), Bishop`s weed (Trachyspermum ammi), Musli (Aneilema scapiflorum), Black cumin (Nigella sativa), Sensitive plant (Mimosa pudica), Rhubarb (Rheum emodi), God Mar (Gymnema sylveseter), Water chestnut (Trapa bispinosa), Chaksu (Cassia absus) and Nuts-cooling (Wathania coagulans) showed manganese levels > 200 μg g ha-1 . Copper levels > 50 μg g ha-1 were found in Basil (Ocimum basilicum), Liquorice (Glycyrrhiza galbra), Fennel (Foeniculum vulgare), Syrian rue (Peganum harmala), Bishop`s weed (Trachyspermum ammi), Chilli (Capcicum freutenscens), Musli (Aneilema scapiflorum), Jujube fruit (Ziziphus vulgaris), Black cumin (Nigella sativa), Sensitive plant (Mimosa pudica), Colecynth (Citrullus colocynthis), God Mar (Gymnema sylveseter), Water chestnut (Trapa bispinosa), Chaksu (Cassia absus) and Nuts-cooling (Wathania coagulans). Iron levels in these plant samples were found to be comparatively higher than all other metals investigated but some of the plants including Mint (Mentha arvensis), Liquorice (Glycyrrhiza galbra), Syrian rue (Peganum harmala), Musli, (Aneilema scapiflorum), sensitive plant (Mimosa pudica), Rhubarb (Rheum emodi), God Mar (Gymnema sylveseter), Chaksu (Cassia absus) and Nuts-cooling (Wathania coagulans) showed very high Iron contents (i.e. > 4000 μg g ha-1 ). The present study provides baseline data on essential trace metal levels in spices and medicinal plants commonly used for the treatment of different ailments. This data also suggests that use of various spices and herbs in food recipes and medicinal preparations is a source of essential trace metal supplements in addition to their antimicrobial characteristics.
 
 
 
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