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by
M.A. Aziz |
Total Records (
3 ) for
M.A. Aziz |
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A.E. De Silva
,
M.A. Kadir
,
M.A. Aziz
and
S. Kadzimin
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The induction of callus from Meristemic
Globular Bodies (MGB) of two pineapple cultivars, namely Moris and Josapine,
under six concentration levels of auxin NAA and six concentration levels
of 2,4-D in Murashige and Skoog solid media, was investigated. 2,4-D auxin
treatments failed to induce calli in both cultivars. However, 53.71, 75.19
and 85.93 μM levels of auxin NAA caused calli induction in Moris
while levels 32.22, 53.71 and 75.19 μM also induced calli Josapine.
The percentage of MGB calli formation increased with increasing time of
culturing. At 6 weeks of culturing, 83% of Moris MGB explants formed calli
on 85.93 μM NAA, while 50% of Josapine MGB explants formed calli
on 53.71 μM NAA. Calli cultures have been an essential tool in the
in vitro selection of desirable plants under manipulated conditions
and from in vitro mutations via somaclonal variation. More importantly,
calli are increasingly used for the application of cellular level genetic
modification techniques such as the Agrobacterium-mediated transformation,
particle bombardment and protoplast isolation and fusion. In this study,
auxin NAA successfully initiated and proliferated calli in Moris and Josapine
globular meristemic cultures. |
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M.A. Aziz
,
M.A.K. Azad
and
M.S. Alam Sarker
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In this study, an attempt is made to study the distribution functions for simultaneous velocity, magnetic, temperature, concentration fields and reaction in MHD turbulent flow undergoing a first order reaction in presence of dust particles. The transport equations for evolution of distribution functions have been derived. The various properties of the distribution function have been discussed. Finally, a comparison of the obtained equation for one-point distribution functions with the first equation of BBGKY hierarchy of equations and the closure difficulty is to be removed as in the case of ordinary turbulence. |
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G. MURTAZA
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A. GHAFOOR
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M. QADIR
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G. OWENS
,
M.A. AZIZ
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M.H. ZIA
and
SAIFULLAH
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Raw sewage is widely used on agricultural soils in urban areas of developing countries to meet water shortages. Although it is a good source of plant nutrients, such sewage also increases the heavy metal load to soils, which may impact the food chain. Management options for sewage contaminated soils includes addition of nontoxic compounds such as lime, calcium sulfate and organic matter, which form insoluble metal complexes, thus reducing metal phytoavailability to plants. In this paper we review the variation in irrigation quality of sewage at different sites and its impact on the quality of soils and vegetables. Although quality of sewage was highly variable at source, yet the effluent from food industries was relatively safe for irrigation. In comparison effluent samples collected from textile, dyeing, calendaring, steel industry, hospitals and clinical laboratories, foundries and tanneries were hazardous with respect to soluble salts, sodium adsorption ratio and heavy metals like zinc, copper, iron, manganese, nickel, cobalt and cadmium. The sewage quality in main drains was better than that at the industry outlet, but was still not safe for irrigation. In general, higher accumulation of metals in fruits and vegetable roots was recorded compared to that in plant leaves. Edible parts of vegetables (fruits and/or leaves) accumulated metals more than the permissible limits despite the soils contained ammonium bicarbonate diethylenetriaminepentaacetic acid extractable metals within a safe range. In either case further scientific investigations are needed to ensure safe management strategies. Cadmium appeared to be the most threatening metal especially in leafy vegetables. It is advisable to avoid leafy vegetables cultivation in sewage irrigated areas everywhere to restrict its entry into food chain. |
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