Peer Reviewed Journal Articles (National) (FT)

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Browsing Peer Reviewed Journal Articles (National) (FT) by Author "Ashraf, M.P."

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    Changes in Phosphate fractions in prawn aquaculture systems at different stages of cropping
    (ICAR, 2003) Ashraf, M.P.; Pillai, A.G.G.
    Studies were conducted to evaluate the flux of phosphate fractions in prawn aquaculture systems in one cropping season and its relation with water and sediment characteristics. The results from the samples of two scientific and one natural culture ponds revealed that there was no loosely bound P in all the three stages of cropping. Al bound P increased significantly at the harvest stage compared to initial stage. This was attributed mainly to readsorption of P on aluminium hydroxides. The utilisation of iron bound P was in the late juvenile stage and that of Ca bound P at the harvest stage. The inorganic P increased from juvenile to late juvenile stage and at harvest it recorded 22.5-36.7% decrease than the late juvenile stage. In the natural pond total P was reduced due to mineralisation of P. 50% of the organic bound P was mineralised in natural pond during initial to late juvenile stage whereas, organic P has only minor role in scientific systems.
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    Corrosion resistance of fishing hooks with different surface coatings
    (Society of Fisheries Technologists (India), Cochin, 2010) Edappazham, G.; Thomas, S.N.; Ashraf, M.P.
    Corrosion of fishing hooks is a major problem faced by hook and line fishing industry. This communication presents the results of a study taken up to assess the corrosion resistance of round bent, flatted hook no. 7 with two differ nt surface coatings; viz., tinned and blued. The hooks were exposed to 300 h of salt spray as per ASTM B 117. The tinned hooks exhibited excellent performance in salt spray exposure in comparison to the blued fishing hooks. The exposure of the hooks .to salt spray resulted in an appreciable weight loss viz., the tinned hooks incurred a loss of 5.37% from the initial weight while the blued hooks lost 20.54% of weight. The corrosion rates of the tinned and blued hooks were found to be 26.934 mpy (mills per year) and 106.298 mpy respectively.
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    Evaluation of corrosion inhibition by cerium on aluminium under marine and laboratory environments
    (NISCAIR, 2004) Ashraf, M.P.; Edwin, L.
    Cerium is considered to be a promising ecological alternative to toxic chromates in the field of corrosion protection. Studies were conducted to evaluate the corrosion inhibition by cerium on aluminium under marine and laboratory environ­ ments. The results revealed that under marine environment 1000 ppm Ce treated pure aluminium showed good corrosion in­ hibition than the Al-Mg alloy M57S. The corrosion rate was significantly high during post monsoon and summer season and cerium treated on pure aluminium showed superior corrosion inhibition in all the seasons. Cerium treated pure aluminium showed better corrosion inhibition as compared to untreated marine grade M57S aluminium. The laboratory evaluation of 1000 ppm cerium treatment on aluminium and its exposure in solutions of different salinity (5 to 200 ppt) revealed 30-66 and 0-92.6% efficient corrosion inhibition in pure and M57S aluminium respectively.
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    Seasonal variation of metal concentration in barnacles (balanus spp.) of Cochin estuary, south west coast of India
    (Society of Fisheries Technologists (India), Cochin, 2007) Ashraf, M.P.; Meenakumari, B.; Thomas, S.N.
    The study was conducted to evalua.te the accumulation of heavy mt!tals in barnacle shells and tissues in different seasons of the year. Heavy metal concentration was monitored in barnacle tissues and·shells on a long term and short term (monthly) basis by exposing giass panels in Cochin estuary. Short term panels gave a clear idea of the dynamics of heavy metal accumulation in barnacles. Accumulation of chromium and cadmium was maximum in the tiss.ues and shell during the monsoon season whereas lead and nickel was maximum in pre monsoon perlod. Selenium varied irregularly and arsenic was detected only in one sample. Higher levels of copper and manganese were observed in shells during both high and low salinity season (pre monsoon and monsoon). Manganese and iron uptake was significantly higher in the initial stages of growth and is mainly utilized for shell formation. Zinc was maximum during monsoon in short term panels whereas in soft tissues of long term panels it was detected during monsoon and pre monsoon seasons. Fouling settlement on exposed glass panels was highest during November, the transition period from monsoon to post monsoon season.