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RISS 인기검색어
- 검색키워드
- 저자 : P. K. Mehta (검색결과 5 건)
- 무료
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Graphene quantum dot modified screen printed immunosensor for the determination of parathion
Mehta, J.,Bhardwaj, N.,Bhardwaj, S.K.,Tuteja, S.K.,Vinayak, P.,Paul, A.K.,Kim, K.H.,Deep, A. Academic Press 2017 Analytical biochemistry Vol.523 No.-
<P>The widespread use of pesticides has immense effect on increased crop productions. However, they are also responsible for posing detrimental health hazards and/or for contaminating the environment with chemical residues. A routine and an on-field detection of pesticide residues in different food, water, and soil samples has become a need of the hour for which biosensors can offer a viable alternative. The present work reports a functionalized graphene quantum dot (GQD) based screen printed electro-chemical immunosensor for the detection of parathion. The application of GQDs has permitted the realization of a sensitive, robust, and reproducible sensor unlike those carried out earlier for the similar purposes. This immunosensor exhibited a dynamic linear response for parathion within the range of 0.01 -10(6) ng/L with a very low detection limit of 46 pg/L. According to the analysis of potential interferences, the proposed sensor was specifically detecting parathion even in the presence of its metabolite, paraoxon. The investigations of the proposed sensing approach with respect to stability, response reproducibility, and regeneration have fully supported its potential practical applicability. (C) 2017 Elsevier Inc. All rights reserved.</P>
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Progress in the biosensing techniques for trace-level heavy metals
Mehta, J.,Bhardwaj, S.K.,Bhardwaj, N.,Paul, A.K.,Kumar, P.,Kim, K.H.,Deep, A. Pergamon Press ; Elsevier Science Ltd 2016 BIOTECHNOLOGY ADVANCES Vol.34 No.1
<P>Diverse classes of sensors have been developed over the past few decades for on-site detections of heavy metals. Most of these sensor systems have exploited optical, electrochemical, piezoelectric, ion-selective (electrode), and electrochemical measurement techniques. As such, numerous efforts have been made to explore the role of biosensors in the detection of heavy metals based on well-known interactions between heavy metals and biomolecules (e.g. proteins, peptides, enzymes, antibodies, whole cells, and nucleic acids). In this review, we cover the recent progress made on different types of biosensors for the detection of heavy metals. Our major focus was examining the use of biomolecules for constructing these biosensors. The discussion is extended further to cover the biosensors' performance along with challenges and opportunities for practical utilization. (C) 2015 Elsevier Inc. All rights reserved.</P>
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FEEDING OF BYPASS PROTEIN TO CROSS BRED COWS IN INDIA ON STRAW BASED RATION
Kunju, P.J.G.,Mehta, A.K.,Garg, M.R. Asian Australasian Association of Animal Productio 1992 Animal Bioscience Vol.5 No.1
Feeding of bypass protein to lactating animals have been suggested by many research scientists as a way to increase the nutrient supply at the intestinal level thereby enhance animal production in ruminant animals. A feeding trial with a formulated bypass protein feed on straw based ration was carried out by using lactating cross bred cows at the stage of 4th month of their lactation. Bypass protein feed was fed at 5 different levels. Urea Molasses Block was used as a nitrogen source to the rumen microflora. In order to reduce the heat increment straw intake was restricted to all the animals. Urea Molasses Block intake was noticed varying in proportion with the bypass protein feed intake. Milk production was observed increasing in accordance with the level of bypass protein feed intake. However, the maximum response was noticed in cows that were fed 3 kg bypass protein feed. The nutrient availability at this stage was below the NRC (1988) requirements. Other remarkable finding was that the cows maintained the persistency of milk production even after 3rd month of lactation when the ambient temperature was $40^{\circ}C$.
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O. P. Chaudhary,P. K. Mehta 한국양봉학회 2007 韓國養蜂學會誌 Vol.22 No.2
Influence of different modes of pollination (MOP's) viz. without insect pollination (WIP), open pollination (OP) and bee pollination (BP) (with Apis mellifera L. honeybees) on peach (Prunus persica L.) cultivar Flordasun was studied at RRS, Karnal. The pole directions had no affect on the fruit set. In WIP, fruit set was minimum (1.6 fruits/branch), increased phenomenally to 6.2 in OP and was maximum (7.3 fruits/branch) in BP. Thus, resulting in an increase of 287.5 percent in fruit set in OP over WIP and 356.3 per cent in BP over WIP, respectively. In WIP, 35.7 per cent branches bore no fruits at all whereas in BP and OP there were no barren branches. Fruit yield was only 68.2 g per branch in WIP increased to 263.4 g in OP (increase of 286.2%) and was maximum (373.0 g) in BP (increase of 446.9%). The fruits in BP were heaviest at 51.1 g (20.0% heavier than WIP and 20.2% than OP), whereas they were significantly lighter and comparable in OP and WIP (42.5 and 42.6 g/fruit, respectively). In WIP, the fruit dimensions were only 4.0×3.6㎝ that improved significantly in BP to 4.6×4.0㎝ (an increase of 15.0% in length and 11.1 % in breadth). The per plant yields in WIP were only 18.3㎏, increased to 70.8㎏ in OP and were highest in BP at 100.7㎏/plant. The per hectare yields too, were least in WIP (49.78q/㏊) and increased to 194.71 q in OP. Employment of honeybee input (BP) further improved it to 276.93q/㏊, registering an increase of 4.5 times than the WIP. BP significantly increased economic returns to the tune of 5.6 times at Rs. 166,158/㏊ compared to a minuscule Rs. 29,868 in WIP. The economic gains in BP were Rs. 133,290/㏊ over WIP and even Rs. 46,305 over OP at a cost: benefit of 1:44.4.
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Full-scale study of conical vortices and roof corner pressures
Wu, F.,Sarkar, P.P.,Mehta, K.C. Techno-Press 2001 Wind and Structures, An International Journal (WAS Vol.4 No.2
A full-scale synchronized data acquisition system was set up on the roof of the experimental building at the Texas Tech University Wind Engineering Research Field Laboratory to simultaneously collect approaching wind data, conical vortex images, and roof corner suction pressure data. One-second conditional sampling technique has been applied in the data analysis, which makes it possible to separately evaluate the influencing effects of the horizontal wind angle of attack, ${\theta}$, and the vertical wind angle of attack, ${\varphi}$. Results show a clear cause-and-effect relationship between the incident wind, conical vortices, and the induced roof-corner high-suction pressures. The horizontal wind angle of attack, ${\theta}$, is shown to be the most significant factor in influencing the overall vortex structure and the suction pressures beneath. It is further revealed that the vertical wind angle of attack, ${\varphi}$, plays a critical role in generating the instantaneous peak suction pressures near the roof corner.
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