Isolation and identification of bacteria from marine market fish Scomberomorus guttatus (Bloch and Schneider, 1801) from Madurai district, Tamil Nadu, India
Abstract The present study was conducted to evaluate the hygienic quality and freshness of fish Indo-pacific King Mackerel “Scomberomorus guttatus” through the investigation of the occurrence of bacteria which is an indicator for fish quality. Fishes were collected every fortnight from Madurai fish market on monthly twice of January 2014 to March 2014. Skin surface of the fish was examined. Escherichia coli, Proteus vulgaris, Bacillus subtilis, Klebsiella pneumonia, Pseudomonas aeruginosa and Staphylococcus aureus were identified by Biochemical tests (IMViC Tests). Among the six bacterial species E. coli and K. pneumonia were found in all the collected samples where as other bacterial species were not found. The result of this study revealed that raw fish sold in Madurai fish market has high contamination so the presence of the bacterial species has strongly suggested the urgent need to improve the quality control systems in Madurai fish market.
Omega-3 Fatty Acids Composition and Lipid Content from Liver and Muscle Tissues of Scomberomorus commerson (Lacepede, 1800) in the Persian Gulf
Studies indicate that omega-3 fatty acids have positive effects on reducing heart diseases several such as myocardial infarction, cardiac arrhythmia, atherosclerosis thrombosis and hypertension. The omega-3 PUFA EPA and DHA are important throughout life and are a dietary necessity found predominantly in fish and fish-oil supplements. In this research, the liver and muscle tissues of Scomberomorus commerson from the Iranian Port of Bandar Abbas in March 2015 were separately extracted for their lipid content especially omega-3 fatty acids composition using the method of Blight & Dyer. The compounds were determined by Gas Chromatography-Mass Spectrometry (GC- MS). The components detected in the liver and muscle tissues, were Palmitic acid, Oleic acid, Eicosapentaenoic acid (EPA) and Docosahexaenoic acid (DHA). The result of this study show that the muscle and liver tissues of Scomberomorus commerson are rich sources of omega-3 fatty acids EPA (18.12-21.63%) and DHA (17.37-19.12- %).
Application of Automatic Tracking Correlation Filtering in Motored Spindle Dynamic Balancing
According to the information characteristics of the dynamic imbalance signal and the definition of correlation function,the principles and algorithm of relevant filter with automatic tracking is given.In labview development system,based on the principles of relevant filter with automatic tracking,the graphics programming of extracting the dynamic imbalance signal is developed.With this programming,the vibration signal including different frequency harmonic signals and noise is processed by simulation and on-site experiment.The results show that: through relevant filter with automatic tracking,the dynamic imbalance signal under different rotating speed can be extracted accurately,and it can meet the requirement of motored spindle dynamic balancing measurement.