Community structure and spatial patterns in hard coral diversity of Agatti Island, Lakshadweep, India

Lakshadweep Island cluster is the single atoll reef formation in India, which is reported to be facing climate abnormalities since the past few decades. Scleractinian corals form the structural framework of any coral reefs and are very important in the existence of atoll reef systems. In the present study an attempt was made to investigate the hard coral diversity, live/dead coral cover, as well as health status of reef system surrounding Agatti Island in the Lakshadweep Sea, adopting the Line Intercept Transect (LIT) method. Seventy one species were recorded from the island, of which 37 were new to the reef. Acropora formosa (Dana, 1846) with a total cover of 18.3% showed maximum abundance followed by Porites lutea (14.8%) and Porites lichen (10.7%). Percentage live coral cover was recorded as fair (48.6%) and coral mortality index (0.29) indicated that the reef is in the borderline between healthy and sick state. Proper management measures should be adopted to increase the coral cover of the reef area and to prevent further destruction of the reef

Mass spawning of Scleractinian corals in the Lakshadweep Archipelago

Multispecific synchronous spawning of scleractinian corals has been observed in the Lakshadweep atolls on the morning of sixth day after new moon during March. A team of CMFRI scientists of the Marine Biodiversity Division who were carrying out survey at Bengaram- Tinnakkara Island cluster witnessed this phenomenon at 10.00 am of 18th March 2013

Chromosome stability of callus cultures of Crocus sativus

Two year old canus cultures, raised from corm explants of Crocus sativus, showed an unusual chromosome number stability when maintained on MS medium supplemented with 2,4-D (2 mg/l) and kinetin (0.5 mg/l). Such studies may give an insight into the po·ssible origin of somaclonal variants. &nbsp

लक्षद्वीप के चुने गए द्वीपों में समुद्री शैवालों की विविधता

समुद्री शैवाल माक्रोस्कोपिक, बहुकोशिकीय स्‍थूल शैवाल को संदर्भित करता है। समुद्र, मुहानों और पश् चजलों के उथले पानी में इन् हें पाया जाता है। भारतीय समुद्र से पाए जाने वाले अधिकांश समुद्री वाल मुख् यत: चार ग्रुपों में विभाजित कि या जाता है, जो कि क्‍लोरोफाइसिए, फियोफाइसिए, रोडोफाइसिए और सयनो फाइसिए। एगार, एगरोस, कैरागीनन और एल्जिनेट जैसे फाटो केमि कल्स के उत्‍पा दन के लिए समुद्री शैवालों का उपयोग किया जाता है

Planar reorientation maneuvers of space multibody systems using internal controls

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/77104/1/AIAA-11411-971.pd

Interaction of cylindrical polymer brushes in dilute and semi-dilute solution

We present a systematic study of flexible cylindrical brush-shaped macromolecules in a good solvent by small-angle neutron scattering (SANS), static light scattering (SLS), and by dynamic light scattering (DLS) in dilute and semi-dilute solution. The SLS and SANS data extrapolated to infinite dilution lead to the shape of the polymer that can be modeled in terms of a worm-like chain with a contour length of 380 nm and a persistence length of 17.5 nm. SANS data taken at higher polymer concentration were evaluated by using the polymer reference interaction site model (PRISM). We find that the persistence length reduce from 17.5 nm at infinite dilution to 5.3 nm at the highest concentration (volume fraction 0.038). This is comparable with the decrease of the persistence length in semi-dilute concentration predicted theoretically for polyelectrolytes. This finding reveals a softening of stiffness of the polymer brushes caused by their mutual interaction

செயற்கை திட்டுகள் ஓர் அறிமுகம், வரையறைகள், வரலாறு மற்றும் இந்தியாவில் அவற்றின் பயன்பாட்டு நிலை

Artificial reefs - definition, history and status in India: World fisheries today face threats from several quarters, including non-judicious fishing practices influenced by irrational growth in demand, destruction of aquatic habitats through pollution and destructive fishing methods, rupture of trophic food webs by increased exploitation of particular fishery resources, increased incidences of natural disasters and the impacts of climate change. With increasing concern over global marine fish production, and the scenario being not very different in India, there is an urgent need to evolve resource-, area-, and habitat-specific management tools to revive, sustain or improve Indian marine fisheries and marine ecosystems. The immediate and primary objective of a management strategy would ideally look towards enhancing fish catches

Biodegradation of the pyrethroid pesticide cyfluthrin by the halophilic bacterium Photobacterium ganghwense isolated from coral reef ecosystem

A halophilic bacterial strain T14 isolated from the mucus of coral Acropora formosa was found to be highly effective in degrading the pyrethroid pesticide, cyfluthrin. T14 was identified as Photobacterium ganghwense (GenBank Accession No. MT360254) based on phenotypic and biochemical characteristics as well as by 16S rRNA gene sequence analysis. The pyrethroid degrading efficiency of P. ganghwense T14 strain was examined under different culture conditions. It was observed that P. ganghwense T14 was able to utilise cyfluthrin as a sole carbon source and was found to grow on mineral medium with pesticide concentrations ranging from 10 to 100 mg l-1

कृत्रिम चट्टान - परिभाषा, इतिहास और भारत में स्थिति

कृत्रिम चट्टान - परिभाषा, इतिहास और भारत में स्थित

Artificial reefs - definition, history and status in India

World fisheries today face threats from several quarters, including non-judicious fishing practices influenced by irrational growth in demand, destruction of aquatic habitats through pollution and destructive fishing methods, rupture of trophic food webs by increased exploitation of particular fishery resources, increased incidences of natural disasters and the impacts of climate change. With increasing concern over global marine fish production, and the scenario being not very different in India, there is an urgent need to evolve resource-, area-, and habitat-specific management tools to revive, sustain or improve Indian marine fisheries and marine ecosystems. The immediate and primary objective of a management strategy would ideally look towards enhancing fish catches