1,304 research outputs found
Cardiac myxosporiosis of pearl-spot, Etroplus suratensis (Bloch), due to Myxobolus etropli sp. nov.
A new myxosporea, Myxobolus etropli sp. now, was
found to infect the bulbus arteriosus of Etroplus suratensis from brackishwarer lasoons of Muaulkadu. Chenna
Change in the room temperature magnetic property of ZnO upon Mn doping
We present in this paper the changes in the room temperature magnetic
property of ZnO on Mn doping prepared using solvo-thermal process. The zero
field cooled (ZFC) and field cooled (FC) magnetisation of undoped ZnO showed
bifurcation and magnetic hysteresis at room temperature. Upon Mn doping the
magnetic hysteresis at room temperature and the bifurcation in ZFC-FC
magnetization vanishes. The results seem to indicate that undoped ZnO is
ferromagnetic while on the other hand the Mn doped ZnO is not a ferromagnetic
system. We observe that on addition of Mn atoms the system shows
antiferromagnetism with very giant magnetic moments.Comment: 5 figure
Fish health management in cage aquaculture
Finfish is the primary source of animal protein for
humans in many parts of the world and per capita
consumption of fish has been increasing from an
average of 9.9 kg in the 1960s to 19.2 kg in 2012 (FAO,
2014). Growing global population, dwindling natural
fish stocks, and the increasing demand are the major
drivers for increasing fish production. Aquaculture
remains the only option to meet these demands and
globally, the share of aquaculture is projected to rise
to 62% of the total fish production by 2030. However,
considering the limitations of the traditional
aquaculture systems due to environmental issues,
carrying capacities etc., it has been recognized that
cage culture, especially mariculture has many
advantages. Over the years, cage culture has become
one of the economically viable methods of large-scale
production of high-value food fishes
Experimental host range and histopathology of white spot Syndrome virus (WSSV) infection in shrimp, prawns, crabs and lobsters from India
Experimental studies were conducted by injecting
of feeding white spot syndrome virus(WSSV)
derived from infected shrimp, Penaeus monodon
fabricius collected from the South East coast of
Indi
Appraisal on the marine fishing craft and gear of the Indian coast
The use of fishing methods varying from simple traps to large trawlers
and from hand lines to sophisticated purse seines is a typical feature
of marine fisheries in India. The regional and seasonal variation is so
vast that the developmental agencies and administrative machinery are
often handicapped in deciding priorities on modernizing the traditional
tools. A document as attempted here, would form a piece of vital information
for the R&D agencies. The traditional gear operated in different regions
of the Indian coast are classified based on the mode of operation and an
exhaustive listing along with local names is attempted. Besides,
contributions to the marine fish production separately by traditional and
modern craft are brie flu noted
White spot syndrome virus (WSSV) infection in tiger shrimp Penaeus monodon: A non-lethal histopathological rapid diagnostic method using paraffin and frozen sections
White spot syndrome virus (WSSV) infection was induced in tiger shrimp, Penaeus
monodon, under laboratory conditions, and histopathological changes in subcuticular epithelial
cells of the eye stalk and pleopod were studied sequentially at different time post-challenge. Routine
histological techniques using paraffin embedded tissues, as well as frozen tissues, were used to
document WSSV infection. Histological manifestations such as cellular hypertrophy in the subcuticular
epithelial cells of the eyestalk and pleopod could be detected as early as 18 h postinfection
(p.i.) before the manifestation of clinical signs of the diseas
Macro micronutrients and Antioxidant Potentials of Plants and Fungal based Food from Tawang Area Arunachal Pradesh India
Certain variety of plants such as vegetables, spices and seaweed are abundantly being grown in high altitude cold desert region of Tawang in Arunachal Pradesh, India. Therefore, five different vegetables, spices and seaweed were taken from that particular cold region viz., finger millet, nori seaweed, pepper corn, bean and mushroom have been selected based on the higher consumption of people of Northeast (NE) India for the proximate analysis, mineral, antioxidant and vitamin contents. So far, there is no nutritional composition studies have been carried out with available vegetables, spices and seaweeds growing in NE. For this reason, this study was undertaken to determine the macro and micro nutrients and antioxidant potential of these plant foods. Different analyzed varieties were significantly different for proximate composition and mineral content, and each variety showed significant differences. Common bean showed higher percentage of protein with 35.09% and fat percentage of the finger millet is higher (9.2%) as compared to other varieties from other regions (1-1.5%). Higher crude fibre was assessed in mushroom with 47.77% followed with pepper corn (38.42%), bean with 30.987%, and finger millet (5.14%).Calcium was higher in finger millet with 225 mg per 100g whereas iron content was higher in mushroom with 652 mg followed with beans (543 mg), pepper corn (408 mg per 100g). Higher amount of polyphenols observed in finger millet with 8.716 ┬╡g (GAE)/mg and highest total flavonoids in pepper corn with 48.196 ┬╡g (RU)/ml. Likewise, highest FRAP in finger millet noticed with 72.0 ┬╡g of FeSO4 equivalent /mg and reducing power (ascorbic acid equivalent /mg) in mushroom (244.0) and pepper corn (242.0). All samples had higher metal chelating activity between 86.657- 83.383 IC50 ┬╡g. Similarly, higher amount of vit B6 was noted in pepper corn with 197.0 mg while lowest in seaweed with 1.76 mg/100gm.
 
ENHANCED PHOTOLUMINESCENCE OF ZnS NANOPARTICLES DOPED WITH TRANSITION AND RARE EARTH METALLIC IONS
Pure and doped ZnS nanocrystalline phosphors were prepared at room temperature using a chemical synthesis method. Transmission electron microscopy observation shows that the size of the ZnS crystals is in the 2-3 nm range and SAED pattern confirms the cubic and crystalline nature of the observed samples, which are in agreement with X-Ray analysis. Interesting luminescence characteristics such as strong and stable visible-light emissions were observed from the doped ZnS nanocrystals at room temperature whereas dominant UV emissions were observed for pure ZnS. These results strongly suggest that impurities, especially transition metals and rare-earth metals-activated ZnS nanocrystals are useful in the field of optoelectronics
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