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( Atanu Bhattacharyya ),( Arunava Goswami ),( Shankar Dihidar ),( Sujit Adhikari ),( Sudip Kumar Banerjee ),( Soumendra Nath Talapatra ),( Bikas Ranjan Barik ),( Subir Kumar Bhattacharya ),( Asit Kuma 한국잠사학회 2007 International Journal of Industrial Entomology Vol.14 No.1
Hexane extract of Porteresia coarctata (Roxb.) exhibits a toxic effect on the tissues of Spodoptera litura (F) while fed at the dose of 1000 and 2000 ppm thoroughly mixing with castor leaves (Ricinus communis L) after dissolving in DMSO at late fourth instar whereas only DMSO treated castor leaves were fed to control group. The larvae were put to rear at 28°C±1°C, 76±4% R.H. under 12 L + 12 D photoperiodic regime. In test group insects substantial reduction of protein and DNA content was marked in fat body and midgut tissues compared to DMSO treated control group. The significant biochemical alterations in the midgut tissues and fat body of test group insects indicate the insecticidal property of the said plant extract that could be tested in facilitating the phenomenal stride in Integrated Pest Management.
Atanu Seni,Vinod K. DILAWARI,Virash K. GUPTA 한국곤충학회 2010 Entomological Research Vol.40 No.1
The flowering stage of African marigold Tagetes erecta (L.) was the most preferred for oviposition by Helicoverpa armigera (Hübner). The lower sides of leaf margins received more eggs compared to buds, stem tip and flowers. Olfactometer studies revealed that more female moths were attracted towards the flower extracts, followed by leaf, bud and stem tip extracts of African marigold. The thin layer chromatography analysis of these extracts showed a blend of compounds including careen, ocimene, methyl benzoate, phenyl acetaldehyde and phenyl ethanol. Attempts have been made to correlate insect behavior with the presence of these compounds.
Atanu Pal,Janak Saada,Sandeep Kapur,Richard Tighe,Adam Stearns,James Hernon,Chris Speakman 대한대장항문학회 2021 Annals of Coloproctolgy Vol.37 No.2
Purpose: Malignant large bowel obstruction is a surgical emergency that requires urgent decompression. Stents are increasingly being used, though reported outcomes are variable. We describe our multidisciplinary experience in using stents to manage malignant large bowel obstruction. Methods: All patients undergoing colorectal stent insertion for acute large bowel obstruction in a teaching hospital were included. Outcomes, complications, and length of stay (LOS) were recorded. Results: Over a 7-year period, 73 procedures were performed on 67 patients (37 male, mean age 76 years). Interventional radiology was involved in all cases. Endoscopic guidance was required in 24 cases (33%). In 18 patients (27%), treatment intent was to bridge to elective surgery; 16 had successful stent placement; all had subsequent curative resection (laparoscopic resection 8/18, primary anastomosis 14/18). Overall LOS, including both index admission and elective admission, was 16.4 days. Treatment intent was palliative in 49 patients (73%). In this group, stents were successfully placed in 41/49 (84%). Complication rate within 30 days was 20%, including perforation (2 patients), per rectal bleeding (2), stent migration (1), and stent passage (5). Nineteen patients (39%) required subsequent stoma formation (6 during same admission, 13 during subsequent admission). Overall LOS was 16.9 days. Conclusion: In our experience colorectal stents can be used effectively to manage malignant large bowel obstruction, with only selective endoscopic input. As a bridge to surgery, most patients can avoid emergency surgery and have a primary anastomosis. In the palliative setting, the complication rate is acceptable and two-thirds avoid a permanent stoma.
Beneficial Role of Vitamin D on Endothelial Progenitor Cells (EPCs) in Cardiovascular Diseases
Atanu Sen,Vinnyfred Vincent,Himani Thakkar,Ransi Abraham,Lakshmy Ramakrishnan 한국지질동맥경화학회 2022 지질·동맥경화학회지 Vol.11 No.3
Cardiovascular diseases (CVDs) are the leading cause of death in the world. Endothelial progenitor cells (EPCs) are currently being explored in the context of CVD risk. EPCs are bone marrow derived progenitor cells involved in postnatal endothelial repair and neovascularization. A large body of evidence from clinical, animal, and in vitro studies have shown that EPC numbers in circulation and their functionality reflect endogenous vascular regenerative capacity. Traditionally vitamin D is known to be beneficial for bone health and calcium metabolism and in the last two decades, its role in influencing CVD and cancer risk has generated significant interest. Observational studies have shown that low vitamin D levels are associated with an adverse cardiovascular risk profile. Still, Mendelian randomization studies and randomized control trials (RCTs) have not shown significant effects of vitamin D on cardiovascular events. The criticism regarding the RCTs on vitamin D and CVD is that they were not designed to investigate cardiovascular outcomes in vitamin D-deficient individuals. Overall, the association between vitamin D and CVD remains inconclusive. Recent clinical and experimental studies have demonstrated the beneficial role of vitamin D in increasing the circulatory level of EPC as well as their functionality. In this review we present evidence supporting the beneficial role of vitamin D in CVD through its modulation of EPC homeostasis.
A general adaptive allocation design for continuous responses in the presence of covariates
Atanu Biswas 한국통계학회 2009 Journal of the Korean Statistical Society Vol.38 No.4
Several adaptive allocation designs are available in the clinical trial literature for allocating the entering patients among two competing treatments, having binary responses and skewing the allocation in favor of the better treatment. No adaptive design is available for continuous responses in the presence of prognostic factors, which is not model based. In the present paper, a general allocation design is introduced which assumes no specific regression model or distribution of responses. Some performance characteristics of the design are studied. Some related inference, following the allocation, is also studied. The proposed procedure is compared with some possible competitors. A real data set is used to illustrate the applicability of the proposed design.
Atanu Bag,Ki‑Seong Park,Shi‑Hoon Choi 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.1
The effect that the deformation state exerts on both the electrical and the mechanical degradation of Cu thin film on a flexiblePI substrate was investigated via cyclic sliding test. Two opposite types of deformation (tension and compression) wereapplied to Cu thin film depending on its outward or inward placement in the cyclic sliding test system. During the cyclicsliding test, the change in electrical resistance of the Cu thin films was monitored using a two-point probe method. Systematicsurface observation of deformed Cu thin film under the two opposite types of deformation was performed following specificcycles of sliding motion. Surface observation based on field emission scanning electron microscopy and 3D confocal laserscanning microscopy had been done to quantify the evolution of intrusion extrusions and surface roughness on the deformedCu thin film. The distribution of microcracks significantly depended on the type of stress/strain applied to the Cu thin filmon a flexible PI substrate during the cyclic sliding test. Finite element analysis was performed to explain the deformationbehavior of the Cu thin film on a flexible PI substrate during the cyclic sliding test.
Multi-arm response-adaptive designs for circular responses
Atanu Biswas,Rahul Bhattacharya,Taranga Mukherjee 한국통계학회 2019 Journal of the Korean Statistical Society Vol.48 No.4
A multi-arm response-adaptive allocation design is developed for circular treatment outcomes. Several exact and asymptotic properties of the design are studied. Stage-wise treatment selection procedures based on the proposed response-adaptive design are also suggested to exclude the worse performing treatment(s) at earlier stages. Detailed simulation study is carried out to evaluate the proposed selection procedures. The applicability of the proposed methodologies is illustrated through a real clinical trial data on cataract surgery.
Gas Metal Arc Lap Joining of Aluminium Alloys and Steel Sheets
Atanu Das,Amitava De 대한용접·접합학회 2018 대한용접·접합학회지 Vol.36 No.5
A coupled experimental and theoretical investigation on joining of aluminium and galvanized sheets in lap joint geometry using an advanced pulsed current gas metal arc based process is presented. The experimental study was focussed on finding suitable processing conditions to restrict the heat input, and minimize the growth of the phase layer thickness and the formation of Fe-Al intermetallic compounds along the joint interface. The theoretical study included the development of a three-dimensional heat conduction model to compute the temperature field and thermal cycles, and estimate the final joint bead profiles and phase layer thickness as a function of processing conditions. The estimated results are tested extensively for a wide range of experimental conditions. The experimentally measured and the corresponding computed results show that the dissimilar material combinations of aluminium and galvanized steel can be joined successfully by pulsed current gas metal arc with a precise control of processing conditions and heat input.