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Datta T.K.,West Marine | Gunasekher S.,Marine Biology Regional Center | Mohapatra A.,West Marine
Indian Journal of Geo-Marine Sciences | Year: 2014

Occurrence of free-living marine Nematode Oncholaimellus brevicauda Timm, 1969 is recorded with morphological description of both male and female for the first time from India. Genus is characterized by a massive right subventrolateral tooth and transverse band in buccal cavity. Species is different from the other Indian species of same genus in having long spicules with two-waved upward directing end part in male and short tail with spinneret at the tail end. © 2014, National Institute of Science Communication and Information Resources (NISCAIR). All rights reserved. Source

Rajaraman S.,SSN College of Engineering | Subbiahdoss G.,SSN College of Engineering | Patchirajan P.,Marine Biology Regional Center
International Journal of Bio-Science and Bio-Technology | Year: 2014

Microbial biofilms on biomaterial implant surfaces or devices are troublesome, since biofilm organisms are protected by matrix of exopolymeric substances, impenetrable for most antibiotics and immune cells. It is established that bacterial adhesion to surface is required for colonization and subsequent biofilm formation. The adherent state is important for bacterial survival and development of infection. Therefore, prevention of bacterial adhesion and biofilm growth on implant surfaces should ultimately prevent the occurrence of infection. Egg white was considered to play an important role in resistance against bacteria for developing embryo mainly during early incubation. Utilization of egg white as a coating to prevent bacterial adhesion and biofilm growth on biomaterials implants is novel. Here, we studied the effect of Hen egg white as a coating to surface, on bacterial (Staphylococcus aureus, Pseudomonas aeruginosa and Escherichia coli) adhesion and biofilm growth. We report that a significant reduction in bacterial adhesion was observed for S.aureus on egg white coated surface compared to control (no egg white coating). Whereas P. aeruginosa and E. coli, do not show any significant difference compared to control. When bacteria were allowed to grow in the presence of egg white, a significant reduction in growth was observed on all bacteria compared to control. Thus Hen egg white potentially used as biological coating on implants for prevention of bacterial adhesion and biofilm formation. © 2014 SERSC. Source

Inbakandan D.,Sathyabama University | Inbakandan D.,Annamalai University | Sivaleela G.,Marine Biology Regional Center | Magesh Peter D.,National Institute of Ocean Technology | And 3 more authors.
Materials Letters | Year: 2012

Biotic factors mediated biosynthesis of nanoparticles is considered as an eco friendly and green technological approach compared to chemical and physical methods. This work reports the biosynthesis of silver nanoparticles using the extract of marine sponge, Acanthella elongata. Water-soluble organics present in marine sponge extract were mainly responsible for the reduction of silver ions. UV-visible spectrum of the aqueous medium containing silver nanoparticles showed plasmon resonance peak at around 426 nm. The X-ray diffraction pattern (XRD) of 2θ=38.1°, 44.3°, 64.5°and 77.4°, confirmed the crystalline nature of the silver nanoparticles. Transmission electron microscopy (TEM) analysis of silver nanoparticles indicated the sizes, ranging from 15 nm to 34 nm in diameter and a spherical shaped polydispersal of the particles. Through Fourier transform infrared spectroscopy (FT-IR) analysis the possible biochemical agent present in the marine sponge extract was identified as amines which were the cause for the bioreduction of silver salt to silver nanoparticles. © 2012 Elsevier B.V. Source

Manikandan B.,National Institute of Oceanography of India | Ravindran J.,National Institute of Oceanography of India | Shrinivaasu S.,Marine Biology Regional Center | Marimuthu N.,Anna University | Paramasivam K.,Marine Biology Regional Center
Environmental Monitoring and Assessment | Year: 2014

Coral reef fishes are exploited without the knowledge of their sustainability and their possible effect in altering the community structure of a coral reef ecosystem. Alteration of the community structure could cause a decline in the health of coral reefs and its services. We documented the coral community structure, status of live corals and reef fish assemblages in Palk Bay at the reef fishing hotspots and its nearby reef area with minimum fishing pressure and compared it with a control reef area where reef fishing was banned for more than two decades. The comparison was based on the percent cover of different forms of live corals, their diversity and the density and diversity of reef fishes. The reef fish stock in the reef fishing hotspots and its neighbouring reef was lower by 61 and 38 %, respectively compared to the control reef. The herbivore fish Scarus ghobban and Siganus javus were exploited at a rate of 250 and 105 kg month-1 fishermen-1, respectively, relatively high comparing the small reef area. Live and dead corals colonized by turf algae were predominant in both the reef fishing hotspots and its nearby coral ecosystems. The percent cover of healthy live corals and live corals colonized by turf algae was <10 and >80 %, respectively, in the intensively fished coral ecosystems. The corals were less diverse and the massive Porites and Favia colonies were abundant in the intensive reef fishing sites. Results of this study suggest that the impact of reef fish exploitation was not solely restricted to the intensively fished reefs, but also to the nearby reefs which play a critical role in the resilience of degraded reef ecosystems. © 2014 Springer International Publishing Switzerland. Source

Knight J.D.M.,Flat l | Devi K.R.,Marine Biology Regional Center
Ichthyological Exploration of Freshwaters | Year: 2014

Chela macrolepis, new species, is described from Chennai, Tamil Nadu, India. It is distinguished from all Indian and Sri Lankan species of Chela and Laubuka by the combination of the following characters: 35-40 + 1-3 lateral-line scales; 16 precaudal vertebrae; 23-24 predorsal scales; and 5,4,1 teeth on the fifth ceratobranchial. Chela macrolepis possesses characters that show affinity to both Chela and Laabaka. © 2014 by Verlag Dr. Friedrich Pfeil, München, Germany. Source

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