Published by: NISCAIR (CSIR)
Subjects: Earth Science
This journal was started in 1972 and this multi-disciplinary journal publishes full papers and short communications in the following areas: marine biology, marine chemistry, marine geology, physical oceanography, ocean engineering, marine instrumentation, marine corrosion and material science, satellite oceanography & modeling, marine engineering, marine pollution, marine archaeology, coastal zone management.
Editor, IJGMS, National Institute of Science Communication And Information Resources, CSIR, K S Krishnan Marg, Pusa Campus,
New Delhi 110 012, India
Phone:25846301,03-07 (Extn-248); Fax:(91)(11) 25847062 E-mail: email@example.com
ISSN No. : 0379-5136
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Occurrence of epibionts in coastal waters of Tamilnadu
Title: Occurrence of epibionts in coastal waters of Tamilnadu
Authors: Vijayalakshmi, S.; Murugesan, P.; Muthuvelu, S.; Balasubramanian, T.
Abstract: Present study provides the distributional records of genera of protozoan ciliates namely Epistylis, Vorticella, Veginicola, Acineta and Tokophyra as epibionts got attached on the body surface of zooplankton such as Labidocera pectinata, Euterpina acutifrons, Pontella danae, Pontella securifer, Corycaus danae, Metis jousseaumei, Disticoulus minor, Lucifer hansei, Tortanus forcipes, Oithona rigida, O.brevicornis and Gastropod veliger collected from Tuticorin and Ennore coastal waters. Five genera of ciliates viz., three peritrichids and two suctorians, were identified and classified within the subclass Peritrichia: Epistylis Ehrenberg, 1830 (Epistylidae), Vaginicola Lamarck, 1816 (Vaginicolidae) and Vorticella Linnaeus, 1767 (Vorticellidae); and Suctoria: Acineta Ehrenberg, 1834 (Acinetidae) and Tokophrya Bütschli, 1889 (Tokophrydae). Data collected suggest that the epibiont attachment on copepods may have a significant impact on the health of the fish population due to the substantial reduction in the population density of the copepods leading to food scarcity for the fish populations which directly depend on them.
Ecological factors and their influence on actinobacterial density from different coastal habitats of Neil island, Andamans
Title: Ecological factors and their influence on actinobacterial density from different coastal habitats of Neil island, Andamans
Authors: Poongodi, Subramaniam; Sivakumar, Kannan; Sivasankar, Palaniappan; Kannan, Lakshmanan
Abstract: Sediment and water samples were collected from three different coastal habitats (Mangrove, Coral reef and Beach) of the Neil island, the Andamans, to estimate various physico-chemical parameters viz. temperature, salinity, pH, DO, EC, Total organic carbon, nutrients and soil texture. Principal Component Analysis (PCA) and Cluster analysis (CA) were used to identify the trends between the highly correlating physico-chemical parameters and the actinobacterial density and it revealed the distinct relationship between the coastal habitats and their physico-chemical parameters with the actinobacterial population density. Positive significant correlation between the actinobacterial density and clay, TOC, sediment pH, potassium (K), nitrogen content, phosphorus content, and EC was noticed in the mangrove habitats, implying that the mangrove environment is worth studying for isolation of actinobacteria that might prove to be novel and potential, for commercial applications.
Reactive power compensation and harmonic mitigation through quasi Z source converter for marine applications
Title: Reactive power compensation and harmonic mitigation through quasi Z source converter for marine applications
Authors: Rajmohan, Rajalakshmi; Vairamani, Dr. Rajasekaran; Selvaperumal, Dr.S.
Abstract: This research work brings out the unique approach for attaining an efficient grid connected PV system with suppression of current harmonics by Shunt Active Power Filter (SAPF) as grid connected inverter. But the performance of SAPF is not consistent and is varied based on the control techniques. Filter currents are created using Phase Locked Loop (PLL) based park transformation. Control loops of SAPF are employed with Proportional Integral (PI) controllers. Tuning of PI controller is found to be crucial in improving the harmonic compensation of SAPF. Various optimization algorithms are used for obtaining optimized control parameters of PI controller. Self tuning of PI controller is proposed through Imperialist Competitive Algorithm (ICA) to get the optimal value of PI parameters. Simulation works are carried out in MATLAB/Simulink and the performance of this proposed approach is compared in minimizing Total Harmonic Distortion (THD), to maintain the quality of utility grid without distortion and thus increasing energy efficiency of the system.
Isolation, phylogenetic diversity and screening of bioprospecting potentials of ascidians - associated bacteria from Gulf of Mannar, Southeast coast of India
Title: Isolation, phylogenetic diversity and screening of bioprospecting potentials of ascidians - associated bacteria from Gulf of Mannar, Southeast coast of India
Authors: Ananthan, Gnanakkan; Sathishkumar, Ramamoorthy
Abstract: A total of 93 culturable heterotrophic bacteria were isolated from eight ascidians species. Among these, 10 isolates showed extracellular enzymatic and antimicrobial activities against pathogenic bacteria. These ascidian associated potential bacteria were further investigated on their phenotype characters and 16S rRNA genes sequence analysis. Ascidians-associated bacterial strain could be subdivided into two phylogenetically different clusters; two strains were affiliated with Firmicutes (genera Bacillus and Marinobacter sp.) and eight with a-Proteobacteria (Vibrio sp.). Potential activities of the three enzymes (protease, lipase and amylase) were recorded from B. subtilis GA CAS8 and Marinobacter sp. GA CAS9. Ascidian-associated bacterial strains, B. subtilis GA CAS8 and Bacillus sp. GA CAS1 exhibited higher antimicrobial activity against both Gram-negative, Gram-positive bacteria and fungi including B. subtilis, B. cereus, S. aureus, V. harveyi, P. aeruginosa and Candida albicans.
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