Rajeeshkumar M.P.,Center for Marine Living Resources and Ecology |
Meera K.M.,Center for Marine Living Resources and Ecology |
Hashim M.,Center for Marine Living Resources and Ecology
Copeia | Year: 2017
A new species of the deep-sea ceratioid anglerfish genus Oneirodes Lütken (Lophiiformes: Oneirodidae) is described on the basis of a single female specimen collected from the Western Indian Ocean. The new form is distinguished from its congeners by a combination of features that includes a relatively short illicium, a unique escal morphology, and shape of the subopercle bone. © 2017 by the American Society of Ichthyologists and Herpetologists.
Afsal V.V.,Microbiology and Biochemistry |
Antony S.P.,Microbiology and Biochemistry |
Sanjeevan V.N.,Center for Marine Living Resources and Ecology |
Anil Kumar P.R.,Microbiology and Biochemistry |
And 2 more authors.
Aquaculture | Year: 2012
Anti-lipopolysaccharide factors are small proteins that bind and neutralize lipopolysaccharide and exhibit potent antimicrobial activities. This study presents the molecular characterization and phylogenetic analysis of the first ALF isoform (Pp-ALF1; JQ745295) identified from the hemocytes of Portunus pelagicus. The full length cDNA of Pp-ALF1 consisted of 880 base pairs encoding 293 amino acids with an ORF of 123 amino acids and contains a putative signal peptide of 24 amino acids. Pp-ALF1 possessed a predicted molecular weight (MW) of 13.86. kDa and theoretical isoelectric point (pI) of 8.49. Two highly conserved cysteine residues and putative LPS binding domain were observed in Pp-ALF1. Peptide model of Pp-ALF1 consisted of two α-helices crowded against a four-strand β-sheet. Comparison of amino acid sequences and neighbor joining tree showed that Pp-ALF1 has a maximum similarity (46%) to ALF present in Portunus trituberculatus followed by 39% similarity to ALF of Eriocheir sinensis and 38% similarity to ALFs of Scylla paramamosain and Scylla serrata. Pp-ALF1 is found to be a new isoform of ALF family and its characteristic similarity with other known ALFs signifies its role in protection against invading pathogens. © 2012 Elsevier B.V.
PubMed | Cochin University of Science and Technology and Center for Marine Living Resources and Ecology
Type: | Journal: Journal of applied microbiology | Year: 2016
Production and characterization of polyhydroxybutyrate (PHB) from moderately halophilic bacterium Vibrio harveyi MCCB 284 isolated from tunicate Phallusia nigra.Twenty five bacterial isolates were obtained from tunicate samples and three among them exhibited an orange fluorescence in Nile red staining indicating the presence of PHB. One of the isolates, MCCB 284, which showed rapid growth and good polymer yield, was identified as V. harveyi. The optimum conditions of the isolate for the PHB production were pH 8.0, sodium chloride concentration 20 g lAn isolate of Vibrio harveyi that could effectively utilize glycerol for growth and PHB accumulation was obtained from tunicate Phallusia nigra. PHB produced was up to 72% based on cell dry weight.This is the first report of an isolate of Vibrio harveyi which utilizes glycerol as the sole carbon source for PHB production with high biomass yield. This isolate could be of use as candidate species for commercial PHB production using glycerol as the feed stock or as source of genes for recombinant PHB production or for synthetic biology. This article is protected by copyright. All rights reserved.
Characterization of Histone H2A Derived Antimicrobial Peptides, Harriottins, from Sicklefin Chimaera Neoharriotta pinnata (Schnakenbeck, 1931) and Its Evolutionary Divergence with respect to CO1 and Histone H2A
PubMed | Cochin University of Science and Technology, National Center for Aquatic Animal Health and Center for Marine Living Resources and Ecology
Type: | Journal: ISRN molecular biology | Year: 2016
Antimicrobial peptides (AMPs) are humoral innate immune components of fishes that provide protection against pathogenic infections. Histone derived antimicrobial peptides are reported to actively participate in the immune defenses of fishes. Present study deals with identification of putative antimicrobial sequences from the histone H2A of sicklefin chimaera, Neoharriotta pinnata. A 52 amino acid residue termed Harriottin-1, a 40 amino acid Harriottin-2, and a 21 mer Harriottin-3 were identified to possess antimicrobial sequence motif. Physicochemical properties and molecular structure of Harriottins are in agreement with the characteristic features of antimicrobial peptides, indicating its potential role in innate immunity of sicklefin chimaera. The histone H2A sequence of sicklefin chimera was found to differ from previously reported histone H2A sequences. Phylogenetic analysis based on histone H2A and cytochrome oxidase subunit-1 (CO1) gene revealed N. pinnata to occupy an intermediate position with respect to invertebrates and vertebrates.
Sabu P.,Center for Marine Living Resources and Ecology |
Revichandran C.,National Institute of Oceanography of India
International Journal of Remote Sensing | Year: 2011
The relative importance and contribution of various processes in the total heat budget in the mixed layer of the Arabian Sea Warm Pool (ASWP) during spring intermonsoon (March-April 2004) were studied using in situ observations and satellite data. The evolution of the surface heat budget has been resolved into individual components of advection, vertical mixing, eddy induced diffusion and surface heat fluxes. In the northern part of the warm pool, the surface heat flux is the dominant component in the mixed layer warming while the advection plays a role in spreading the warm water from the coastal region to the far west. In the southern part of the warm pool, the eddy induced horizontal mixing provides a substantial amount of heat spreading that influences the mixed layer temperature evolution. © 2011 Taylor & Francis.
Chatterjee A.,National Institute of Oceanography of India |
Shankar D.,National Institute of Oceanography of India |
Shenoi S.S.C.,Indian National Center for Ocean Information Services |
Reddy G.V.,National Institute of Oceanography of India |
And 6 more authors.
Journal of Earth System Science | Year: 2012
The most used temperature and salinity climatology for the world ocean, including the Indian Ocean, is the World Ocean Atlas (WOA) (Antonov et al 2006, 2010; Locarnini et al 2006, 2010) because of the vast amount of data used in its preparation. The WOA climatology does not, however, include all the available hydrographic data from the Indian Exclusive Economic Zone (EEZ), leading to the potential for improvement if the data from this region are included to prepare a new climatology. We use all the data that went into the preparation of the WOA (Antonov et al 2010; Locarnini et al 2010), but add considerable data from Indian sources, to prepare new annual, seasonal, and monthly climatologies of temperature and salinity for the Indian Ocean. The addition of data improves the climatology considerably in the Indian EEZ, the differences between the new North Indian Ocean Atlas (NIOA) and WOA being most significant in the Bay of Bengal, where the patchiness seen in WOA, an artifact of the sparsity of data, was eliminated in NIOA. The significance of the new climatology is that it presents a more stable climatological value for the temperature and salinity fields in the Indian EEZ. © Indian Academy of Sciences.
Velloth S.,Center for Marine Living Resources and Ecology |
Mupparthy R.S.,National Center for Medium Range Weather Forecasting |
Raghavan B.R.,Mangalore University |
Nayak S.,Earth System Science Organisation
International Journal of Remote Sensing | Year: 2014
Among the various remote-sensing options available today to map ecomorphological classes of corals, hyperspectral remote sensing is one of the best options by virtue of its spectral capabilities, while high spatial resolution is a necessary condition to resolve finer morphological features spatially. Given high-spatial resolution data of equal to or better than 30 m, the discrimination capability of end-members of multi-/hyperspectral satellite data is dependent on the efficacy of the correction for atmospheric effects and the intervening water column. In this study, a coupled approach to account for oceanic and atmospheric radiative contributions, called the Coupled Ocean Atmosphere Radiative Transfer (COART), was applied to Earth Observing 1 (EO-1) mission Hyperion image data acquired over the coral reefs of Agatti Island in the Lakshadweep Islands, Arabian Sea and Flat Island in the Andaman Islands, Bay of Bengal, India. The paper presents an open-source approach to correct and perform unsupervised classification of Hyperion imagery using a custom-built software toolkit called HyperCorals. The study finds that Hyperion has sufficient capabilities for discrimination of a few ecomorphological classes and can be improved further by using coupled radiative transfer models. Correcting for the intervening water column helps in classifying submerged features. The k-means classification offers a simpler classification method to classify an image of a subset with 42 selected spectral channels of Hyperion in the visible and near infrared (VNIR) region than the traditional Iterative Self-Organizing Data Analysis Technique (ISODATA). The classification results using the cosine distance metric over 42 selected spectral channels of Hyperion in the VNIR region offer the potential to differentiate between various ecomorphological zones. The study also presents results from sensitivity analysis experiments and discusses the relative importance of three parameters: water column depth, bottom albedo, and chlorophyll concentration on the overall correction and classification of the imagery. © 2014 Taylor & Francis.
Dhaneesh K.V.,Annamalai University |
Noushad K.M.,Center for Marine Living Resources and Ecology |
Ajith Kumar T.T.,Annamalai University
PLoS ONE | Year: 2012
Estimation of nutrition profile of edible fishes is essential and thus a bio-monitoring study was carried out to find out the nutritional composition of commonly available fishes in Agatti Island water of Lakshadweep Sea. Protein, carbohydrate, lipid, ash, vitamin, amino acid and fatty acid composition in the muscle of ten edible fish species were studied. Proximate analysis revealed that the protein, carbohydrate, lipid and ash contents were high in Thunnus albacares (13.69%), Parupeneus bifasciatus (6.12%), Hyporhamphus dussumieri (6.97%) and T. albacares (1.65%), respectively. Major amino acids were lysine, leucine and methionine, registering 2.84-4.56%, 2.67-4.18% and 2.64-3.91%, respectively. Fatty acid compositions ranged from 31.63% to 38.97% saturated (SFA), 21.99-26.30% monounsaturated (MUFAs), 30.32-35.11% polyunsaturated acids (PUFAs) and 2.86-7.79% branched fatty acids of the total fatty acids. The ω-3 and ω-6 PUFAs were ranged 13.05-21.14% and 6.88-9.82% of the total fatty acids, respectively. Hence, the fishes of Lakshadweep Sea are highly recommended for consumption, since these fishes are highly enriched with nutrition. The results can be used as a baseline data for comparing the various nutritional profiles of fishes in future. © 2012 Dhaneesh et al.
Vijayan A.K.,Center for Marine Living Resources and Ecology |
Somayajula S.A.,Indian National Center for Ocean Information Services |
Somayajula S.A.,Laval University
Oceanologia | Year: 2014
The light absorption properties of a dinoflagellate (Noctiluca scintillans Macartney) bloom in Manila Bay were analysed during the onset of a whole-bay-scale bloom in March 2004. The chlorophyll a concentrations varied over a very wide range from 1.4 μg l-1 to extremely high values of 521 μg l-1. The chlorophyll specific absorption coefficients of phytoplankton (a*ph(λ)) varied significantly in shape and magnitude. The spectrally averaged values of a*ph(λ) varied by two orders of magnitude within and outside the bloom patch. The total suspended solid concentration was high in the middle of the bay (≥ 4 mg l-1). The non-photosynthetic pigment (NPP) index was ~ 0.6 at most of the stations, mainly due to the presence of photoprotective pigments like zeaxanthin, lutein and neoxanthin, which led to variations in the blue absorption maxima of the chlorophyll-specific absorption coefficients. The absorption properties of the accessory pigments were masked owing to the presence of overlapping pigment absorption bands. The fourth derivative of the absorption spectra was able to resolve these overlapping features and enhance the absorption characteristics of prominent accessory pigments. © Polish Academy of Sciences, Institute of Oceanology, 2014.
Parameswaran U.V.,Center for Marine Living Resources and Ecology |
Abdul Jaleel K.U.,Center for Marine Living Resources and Ecology
Zootaxa | Year: 2012
A new species of deep-sea euryalid ophiuroid, Asteroschema sampadae is described from the continental margin off the southern tip of India. This species is distinguished from others in having scattered, distinctly conical epidermal ossicles throughout the aboral surface of the disc and arms and minute, scattered granular ossicles on the oral side. This is the fourth report of the genus Asteroschema from Indian waters (including Andaman & Nicobar Islands) and the first report of this genus from around the Indian peninsula since the report of Asteroschema flosculus from a coral bank off Nellore, Andhra Pradesh by Alcock in 1893. Copyright © 2012 Magnolia Press.