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Textural characteristics of foreshore sediments along Karnataka shoreline,west coast of India

International Journal of Sediment research 2011年第3期26卷 364-375页

作者： G.Udhaba DOrA V.Sanil KUMAr C.Sajiv PHILIP Glejin JOHNSON P.VINAYArAJ r.gowthaman Ocean Engineering Division National Institute of Oceanography(Council of Scientific & Industrial Research)Dona PaulaGoa-403 004India

Grain character analysis of beach sediments along three selected beaches(Pavinkurve,Kundapura and Padukare)of Karnataka coast,west coast of India is carried out in the present *** objective was to identify the textural behavior of beach sediments during an annual cycle from March 2008 to February *** characteristics such as central tendency,sorting,kurtosis and skewness were estimated using GrADISTAT and *** maximum(62%)sediment samples were medium sand with unimodal and bimodal characters at all the three *** median values varied in between-0.04φand 2.74φwith an average value of 1.61φ.The beaches were characterized as well sorted,moderately well sorted and moderately sorted sediment *** were identified as fine skewed to coarse skewed with platykurtic,mesokurtic and leptokurtic characters. Grain characteristics varied spatially and temporally along with beach orientation,foreshore slope and wave action.A negative correlation between mean and sorting is identified for maximum number samples along the study region but not very *** study shows that the sedimentary environment at Kundapura were influenced by relatively high wave action compared to Padukare and Pavinkurve beach and the beaches were under erosion or non-deposition with strong winnowing process.

关键词： Cumulative percentage distribution Central tendency Sorting Skewness Kurtosis

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Occurrence of Clostridium perfringens contamination in poultry feed ingredients:Isolation, identification and its antibiotic sensitivity pattern

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Animal Nutrition 2017年第3期3卷 309-312页

作者： Shanmugasundaram Udhayavel Gopalakrishnamurthy Thippichettypalayam ramasamy Vasudevan gowthaman Shanmugasamy Malmarugan Kandasamy Senthilvel Poultry Disease Diagnosis and Surveillance Laboratory Veterinary College and Research Institute CampusTamil Nadu Veterinary and Animal Sciences University Department of Veterinary Microbiology Veterinary College and Research InstituteTamil Nadu Veterinary and Animal Sciences University

This work has been undertaken to study the occurrence of Clostridium perfringens contamination in the poultry feed ingredients and find out its in-vitro antibiotic sensitivity pattern to various antimicrobial drugs. Two hundred and ninety-eight poultry feed ingredient samples received at Poultry Disease Diagnosis and Surveillance Laboratory, Namakkal, Tamil Nadu in South India were screened for the presence of C. perfringens. The organisms were isolated in Perfringens agar under anaerobic condition and subjected to standard biochemical tests for confirmation. In vitro antibiogram assay has been carried out to determine the sensitivity pattern of the isolates to various antimicrobial drugs. One hundred and one isolates of C. perfringens were obtained from a total of 298 poultry feed ingredient samples. Overall positivity of 33.89% could be made from the poultry feed ingredients. Highest level of C. perfringens contamination was detected in fish meal followed by bone meal, meat and bone meal and dry *** assay indicated that the organisms are highly sensitive to gentamicin(100%), chlortetracycline(96.67%), gatifloxacin(93.33%), ciprofloxacin(86.67%), ofloxacin(86.67%) and lincomycin(86.67%). All the isolates were resistant to penicillin-G. Feed ingredients rich in animal proteins are the major source of C. perfringens contamination.

关键词： Poultry feed ingredients Contamination Clostridium perfringens Isolation Identification Antibiogram

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Quantitative Estimation of Coastal Changes Along Selected Locations of Karnataka, India: A GIS and remote Sensing Approach

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International Journal of Geosciences 2011年第4期2卷 385-393页

作者： P. Vinayaraj Glejin Johnson G. Udhaba Dora C. Sajiv Philip V. Sanil Kumar r. gowthaman 不详

Qualitative and quantitative studies on changes of coastal geomorphology and shoreline of Karnataka, India have been carried out using toposheets of Survey of India and satellite imageries (IrS-P6 and IrS-1D). Changes during 30 years period are studied at each station. Significant morphological changes in landforms like spit, channel Island, coastal plain, tidal flat, lateritic plain, alluvial plain and sand bar within and adjcent to estuarine river mouths of Kali, Sharavathi, Kollur-Chakkara - Haladi and Udyavara rivers are observed. The study indicates that gradual erosion is observed at i) Karwar spit along the northern side of the Kali river mouth, ii) the spit at the southern side of the Sharavathi river mouth and iii) at some regions of Kundapur.

关键词： Coastal Geomorphology Shoreline Coastal zone Erosion Accretion Beach

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Variations in Swells along Eastern Arabian Sea during the Summer Monsoon

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Open Journal of Marine Science 2012年第2期2卷 43-50页

作者： Glejin Johnson V. Sanil Kumar Sajiv Philip Chempalayil Jai Singh Premanand Pednekar K. Ashok Kumar G. Udhaba Dora rajamanickam gowthaman Ocean Engineering CSIR-National Institute of Oceanography (Council of Scientific & Industrial Research) Dona Paula India

A study was carried out to find the variation in wave characteristics along the eastern Arabian Sea and the influence of swells in the nearshore waves at 3 locations during summer monsoon in 2010. Percentage of swells in the measured waves was 75% to 79% at the locations with higher percentage of swells in the northern portion of Arabian Sea com-pared to that at the southern side. The significant wave height up to 4.7 m and maximum wave height up to 7.4 m was observed. The wave height was increasing from south to north with the average significant wave height at the northern location 20% more than that at the southern location due to the increase in the swell height. Waves having spectral peak period less than 6 s were not present during the summer monsoon period. There was no change in the average value of wave statistical parameters for data collected at 1/2, 3, 6, 12 and 24 h interval.

关键词： Seas Swells Wind Waves Arabian Sea Mixed Sea State Wave Spectrum

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