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- 저자 : Yengkokpam, Sona (검색결과 3 건)
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Yengkokpam, Sona,Sahu, N.P.,Pal, A.K.,Mukherjee, S.C.,Debnath, Dipesh Asian Australasian Association of Animal Productio 2007 Animal Bioscience Vol.20 No.1
A Feeding trial was conducted to study the effects of three different sources and two levels of dietary gelatinized carbohydrate (GC) on nutrient utilization, growth, tissue composition and tissue enzyme activities of fingerlings of Catla catla (15.1-15.3 g). Six isocaloric (17.1-17.5 kJ/g) semi-purified diets were prepared either with rice, corn or tapioca at 40 or 50% GC each. The crude protein (CP) level used in the diet was 35% and 25% for 40% and 50% GC level, respectively to study the protein sparing effect of GC. The degree of gelatinization was higher for corn and tapioca than rice under similar cooking conditions. After a 60-d feeding trial, dry matter, carbohydrate, protein and lipid digestibility were higher in tapioca fed groups at both the levels of GC. However, the highest specific growth rate (SGR) and protein efficiency ratio (PER) were observed in the corn fed groups at 50% GC level indicating better utilization of nutrients from gelatinized corn. Feed conversion ratio (FCR) was almost similar in corn and tapioca fed groups between two levels of GC but in rice fed groups, FCR was lower in 40% GC than 50% GC level. The results indicated higher protein-sparing effect in corn and tapioca fed groups than rice fed groups. The order of gelatinized carbohydrate utilization in Catla catla fingerlings at 50% GC level was corn>tapioca>rice. At 40% GC level, corn and tapioca were comparable and more efficiently utilized than rice. In the corn fed groups, 50% GC was comparable with 40% GC level, whereas in rice and tapioca fed groups the 40% GC was better in terms of nutrient utilization. Liver glycogen content and hepatosomatic index were significantly (p<0.05) higher in those groups fed high GC (50%) irrespective of carbohydrate sources. Higher intestinal amylase and glucose-6-phosphate dehydrogenase activities were observed in higher GC fed groups than the lower GC groups. No mortality was found in any groups at any levels of GC.
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Effect and design of Mn2+ doped ZnO nanostructures for photodegradation and energy storage devices
Sivakumar S.,Robinson Yengkokpam 한국물리학회 2023 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.82 No.12
This paper studies the synthesis of Zn1-xMnxO (x=0.00, 0.03, 0.06) nanoparticles using the co-precipitation method. The structural, morphological and optical properties were characterized by XRD, FTIR, SEM, HR-TEM and UV–Visible DRS analysis. The structural analysis indicated a hexagonal shape with good crystallinity of the samples. The FTIR absorption peaks confrmed the formation of Zn–O bonding. The surface morphology and particle size were observed by SEM and HRTEM analysis. The EDS spectra determined the presence of elements Zn, Mn, and O in the samples. The optical band-gap of Mn-doped nanoparticles decreased with increasing concentration from 3.27 eV to 3.09 eV. The photocatalytic activity has been observed with methylene blue (MB) dye under solar irradiation. The Zn0.94Mn0.06O (Mn=0.06) nanoparticles photocatalyst has the highest degradation efciency at 94.08% within 180 min. This result shows that the Mn-doped ZnO enhanced the performance of the photocatalytic activity. In electrochemical performance analysis, undoped and Mn-doped electrodes have been studied 10 mV/s to 100 mV/s scan rate. Mn-doped electrodes decrease the specifc capacitance due to low surface area. However, all the undoped and Mn-doped electrodes possess reduction and oxidation peaks, which is considerable for suitable electrode materials for energy storage devices.
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Present Scenario and Future Prospects of Phytase in Aquafeed - Review -
Debnath, Dipesh,Sahu, N.P.,Pal, A.K.,Baruah, Kartik,Yengkokpam, Sona,Mukherjee, S.C. Asian Australasian Association of Animal Productio 2005 Animal Bioscience Vol.18 No.12
Aquaculture pollution is a major concern among the entrepreneurs, farmers and researchers. Excess discharge of phosphorus and nitrogen into the water bodies is the principal pollutant responsible for this. Plant-based feed ingredients due to its high phytic acid content enhances both nitrogen and phosphorus discharge thereby increasing the pollution level. Dietary phytase treatment is probably the best answer to address this problem. This review explains the nature and properties of phytate, its interactions with other nutrients and the application of phytase in aquafeed to reduce the pollution. This review also covers the different biotechnological aspects for lowering the phytic acid level in the common aquafeed ingredients, as an alternate approach to controlling the pollution level. Some of future research needs have also been highlighted to attract the attention of more researchers to this area.
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