A checklist of seaweeds of the Andaman and Nicobar Islands, India: a way forward for seaweed cultivation, food, and drug applications.

Seaweed exploitation in mainland India was started in early 1970s for various applications. The checklist of seaweeds of mainland India was well documented during 2001. However, rich marine macroalgal diversity found in island ecosystems of Andaman and Nicobar Islands have not been explored until today due to inaccessibility to most remote and protected islands.

Antimicrobial compounds produced by Lysinibacillus odysseyi epiphytic bacteria associated with red algae.

Seaweed epiphytic bacteria are highly host specific and their association is little known. The marine environment of Andaman Islands is rich in algal diversity and their association with microbial communities remains unexplored. We investigated the epiphytic bacterial communities from the intertidal red alga Gracilaria canaliculata.

Correlating Photoluminescence and Structural Properties of Uncapped and GaAs-Capped Epitaxial InGaAs Quantum Dots.

The understanding of the correlation between structural and photoluminescence (PL) properties of self-assembled semiconductor quantum dots (QDs), particularly InGaAs QDs grown on (001) GaAs substrates, is crucial for both fundamental research and optoelectronic device applications. So far structural and PL properties have been probed from two different epitaxial layers, namely top-capped and buried layers respectively. Here, we report for the first time both structural and PL measurements from an uncapped layer of InGaAs QDs to correlate directly composition, strain and shape of QDs with the optical properties.

Antimicrobial Potential of Epiphytic Bacteria Associated With Seaweeds of Little Andaman, India.

Seaweeds of the intertidal regions are a rich source of surface associated bacteria and are potential source of antimicrobial molecules. In the present study, 77 epiphytic isolates from eight different algae collected from Little Andaman were enumerated. On testing for their antimicrobial activities against certain pathogens twelve isolates showed positive and six of them showed significant antimicrobial inhibition zone against type 1, type 2a, type 5, Enterotoxigenic O115, Enteropathogenic serotype O114, ; O1 Ogawa Based on the activity these six isolates (G1C, G2C, G3C, UK, UVAD, and Tor1) were identified by 16S rRNA gene sequence and were found to belong to the phyla Firmicutes and Proteobacteria.

Metal-Insulator Transition Driven by Vacancy Ordering in GeSbTe Phase Change Materials.

Phase Change Materials (PCMs) are unique compounds employed in non-volatile random access memory thanks to the rapid and reversible transformation between the amorphous and crystalline state that display large differences in electrical and optical properties. In addition to the amorphous-to-crystalline transition, experimental results on polycrystalline GeSbTe alloys (GST) films evidenced a Metal-Insulator Transition (MIT) attributed to disorder in the crystalline phase. Here we report on a fundamental advance in the fabrication of GST with out-of-plane stacking of ordered vacancy layers by means of three distinct methods: Molecular Beam Epitaxy, thermal annealing and application of femtosecond laser pulses.