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RISS 인기검색어
- 검색키워드
- 저자 : Gautam Biswas (검색결과 4 건)
- 무료
- 기관 내 무료
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Can insecticide mixtures be considered to surmount neonicotinoid resistance in Bemisia tabaci?
Roy Debashis,Biswas Sujan,Biswas Abhisek,Chakraborty Gautam,Sarkar Pijush Kanti 한국응용곤충학회 2022 Journal of Asia-Pacific Entomology Vol.25 No.2
Cotton whitefly, Bemisia tabaci is an important polyphagous pest worldwide. It is exposed to various chemical insecticides throughout the year, resulting in the rapid development of insecticide resistance. Mixtures of in secticides with distinct modes of action could enhance the toxicity of chemicals more effectively than sequences or rotations in resistant pest populations. Bioassays were conducted to study the efficacy of mixtures of neon icotinoid and ketoenol insecticides at different ratios against a laboratory susceptible (Lab-WB) and a neon icotinoid resistant (TMX-SEL) strain of B. tabaci Asia I. The results showed that mixtures of imidacloprid, acetamiprid, thiamethoxam or dinotefuran with spiromesifen at 1:1, 1:10 and 1:20 ratios and of imidacloprid, thiamethoxam or dinotefuran with spirotetramat at 1:1 ratio significantly increased (p < 0.05) toxicity to neonicotinoids in TMX-SEL strain. The combination indices of each tested neonicotinoids + ketoenols at 1:1 ratio and of acetamiprid + spiromesifen, and imidacloprid or dinotefuran + spirotetramat at 1:10 ratio for TMX-SEL strain were significantly below 1, suggesting synergistic interactions. The inhibitors PBO and DEF largely overcame resistance to the tested neonicotinoids, while none of the synergists significantly restored the sus ceptibility of B. tabaci to ketoenols. Increased activities of P450 monooxygenase and esterase were observed in TMX-SEL strain with an elevated 2.76 and 1.32-fold, respectively. Mixtures of neonicotinoids with spiromesifen or spirotetramat at a 1:1 ratio could be used to restore the neonicotinoid susceptibility in B. tabaci.
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Roy Debashis,Chakraborty Gautam,Biswas Abhisek,Sarkar Pijush Kanti 한국응용곤충학회 2021 Journal of Asia-Pacific Entomology Vol.24 No.1
Twenty-six rice landraces from West Bengal, India were evaluated for antixenosis and tolerance against brown planthopper (BPH) biotype 4 at the Bidhan Chandra Krishi Viswavidyalaya (BCKV), West Bengal. High levels of resistance were observed in six landraces, namely Badshabhog, Gamra, Haldichuri, Janglijata, Kalabhat and Khara. These phenotypically resistant rice landraces including Ptb33 exhibited lowest feeding rate, fecundity, nymphal and adult preference, survival, plant dry weight loss per mg of BPH dry weight produced (PDWL), and higher functional plant loss index (FPLI), more days to wilt and unhatched eggs compared with the susceptible check Swarna. All the landraces were classified into four major clusters at 10 unit distance by the scale of similarity during genetic diversity analysis through 21 gene-linked SSR markers of BPH resistance. Some phenotypically resistant landraces were gathered under the major cluster I indicating their analogous genetic history, while some were grouped with susceptible landraces exhibiting their genetic variation. The resistant landraces can be used as potential donors in the breeding programme for the development of rice varieties with resistance to BPH.
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JIBAN, Abul Jannat,BISWAS, Gautam Kumar,YANG, Shaohua Korea Distribution Science Association 2022 The Journal of Asian Finance, Economics and Busine Vol.9 No.10
Ready-made Garments (RMG) export earnings, which are almost 80% of the total exports of Bangladesh, have been recognized as one of the main catalysts for the recent development of the country. Therefore, the need to determine whether the RMG export had served as a mechanism for increasing the GDP growth as well as the economic development of the country is topical and pressing. We have applied the Johansen Co-integration test and Vector Error Correction Model (VECM) to reveal the linkage of RMG export earnings and other variables with the GDP growth rate in Bangladesh. Using data from 1990 to 2020 for Bangladesh, we have found long-run as well as short-run associations among RMG Export earnings, Foreign Direct Investment (FDI), and GDP growth. A co-integration among the variables is validated through the Johansen Co-integration test. Moreover, a causal correlation running from RMG export earnings to GDP was revealed by the Granger causality test in the long run. Finally, we estimated impulse response functions to observe the variations of model variables in response to a shock. Our result supports the proposition that RMG export earnings are one of the main growth engines in Bangladesh and this sector leads growth in other sectors also in the long term.
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Direct numerical simulation of evaporation in a biporous media
Himadri Chattopadhyay,Sudip K. Samanta,Gautam Biswas,Bharat B. Sharma 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.6
Biporous media having clusters of size range 300 - 425 µm, 425 - 600 µm, > 600 µm have been sintered at 950 °C , 180 min using gas atomized spherical particles (D50 of 90 microns) of pure copper in reducing atmosphere of pure hydrogen gas. MicroCT scan of biporous samples have been performed to and then images have been reconstructed to 3D CAD models, which further have been discretised into tetrahedral mesh using image processing and reconstruction software Avizo Fire 8.0. Direct numerical simulations have been performed to obtain Evaporative heat transfer coefficient (EHTC) over the surface of these biporous clusters. The transient evaporation phenomena and effect of cluster size on evaporation has been investigated in this paper. These results have been compared with the experimental results available in literature for evaporative heat transfer coefficient for biporous media.
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