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On chip chiral and plasmonic hybrid dimer or tetramer:Generic way to reverse longitudinal and lateral optical binding forces

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Chinese Physics B 2022年第5期31卷 305-316页

作者： sudipta biswas Roksana Khanam Rumi Tasnia Rahman Raima Saikat Chandra Das M R C Mahdy Department of Electrical&Computer Engineering North South UniversityBashundharaDhaka1229Bangladesh

For both the longitudinal binding force and the lateral binding force,a generic way of controlling the mutual attraction and repulsion(usually referred to as reversal of optical binding force)between chiral and plasmonic hybrid dimers or tetramers has not been reported so *** this paper,by using a simple plane wave and an onchip configuration,we propose a possible generic way to control the binding force for such hybrid objects in both the near-field region and the far-field *** also investigate different inter-particle distances while varying the wavelengths of light for each inter-particle distance throughout the *** of all,for the case of longitudinal binding force,we find that chiral-plasmonic hybrid dimer pairs do not exhibit any reversal of optical binding force in the near-field region nor in the far-field region when the wavelength of light is varied in an air ***,when the same hybrid system of nanoparticles is placed over a plasmonic substrate,a possible chip,it is possible to achieve a reversal of the longitudinal optical binding ***,for the case of lateral optical binding force,we investigate a setup where we place the chiral and plasmonic tetramers on a plasmonic substrate by using two chiral nanoparticles and two plasmonic nanoparticles,with the setup illuminated by a circularly polarized plane *** applying the left-handed and the right-handed circular polarization state of light,we also observe the near-field and the far-field reversal of lateral optical binding force for both *** far as we know,so far,no work has been reported in the literature on the generic way of reversing the longitudinal optical binding force and the lateral optical binding force of such hybrid *** a generic way of controlling optical binding forces can have important applications in different fields of science and technology in the near future.

关键词： longitudinal binding force plasmonics chirality optical force

Molecular determinants regulating the release of the egg during ovulation:Perspectives in piscine models

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Aquaculture and Fisheries 2022年第5期7卷 583-594页

作者： Soumyajyoti Ghosh Subhasri biswas sudipta Maitra Molecular and Cellular Endocrinology Laboratory Department of ZoologyVisva-Bharati UniversitySantiniketan731235India

Reproduction in bony fish,specifically in the female teleost,encompasses well-defined stages,including growth and development,final oocyte maturation and finally ovulation-a pre-requisite for forming fertilizable female *** morphological changes encountered during ovulatory response engage a multitude of endocrine,autocrine,and paracrine *** include gonadal steroids,growth factors,inflammatory cytokines,prostaglandins,leukotrienes and matrix *** recent years,the active participation of prostaglandins and their receptors in LH-dependent ovulatory action has received much *** evidence also supports the participation of nitric oxide/nitric oxide synthase(NO/NOS)unit in regulating meiotic maturation and ovulatory ***,relatively less information is available on physiological relevance,the inter-relationship and the conjoined efforts of these molecular candidates to trigger ovulation in the fish *** prime objective of the present article is to summarize the potential cross-talk between major molecular candidates downstream of LH action in the follicular ***,the intraovarian role of prostaglandin(PG)vis-`a-vis NO/NOS system on mammalian and teleost ovulatory response has been emphasised.

关键词： Luteinizing hormone(LH) Ovulation Growth factors Inflammatory cytokines Prostaglandins Nitric oxide

Green Degumming of Silk by Enzyme Extracted from Natural Sources

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Journal of Materials Science and Chemical Engineering 2020年第8期8卷 30-40页

作者： Mahbubur Rahman Asim Bhowmik sudipta Das Kartick Chowhan Tanmoy biswas Department of Textile Engineering Mawlana Bhashani Science and Technology University Tangail Bangladesh

The main objective of this work is to degum the silk with natural enzyme in lieu of conventional degumming to make it sustainable. Fibroin and sericin are the main composition of silk. Sericin provides a harsh and stiff effect of silk and decreases the valuable property like luster and whiteness and also leads to uneven dyeing. It is necessary to remove this sericin for the better post processing of silk. The removal process of sericin from silk is called degumming. Usually degumming process is done by using chemicals like soda (Na2CO3), detergent and other chemical staffs. But these chemicals are lethal to the environment. So, if such component found that can be substitute the fatal components and give the same required result or very close then that would be considered as an asset. This work deals with the different enzymes extracted from natural sources such as papaya skin, pineapple skin and guava leaf with variation of enzyme concentrations such as 10 (%), 15 (%) & 20 (%) as well as 35°C 45°C & 55°C temperatures that influence the degumming efficiency. By analyzing the various samples on the basis of degumming efficiency and other tests such as tensile strength, water vapor permeability, pilling and abrasion, crease recovery, whiteness test and spot test are done by standard method, it is found that the enzyme extracted from papaya skin shows the best degumming efficiency 15.9 (%) and other tests also show the good result at 15 (%) concentration and 45°C temperature whereas degumming efficiency 16.6 (%) for conventional process. From this work, it can be concluded that enzyme extracted from papaya skin can be substituted of conventional degumming which is also ecofriendly.

关键词： Degumming Silk Enzyme Pineapple Skin Ecofriendly

Contaminated Effect of Geomagnetic Storms on Pre-Seismic Atmospheric and Ionospheric Anomalies during Imphal Earthquake

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Open Journal of Earthquake Research 2020年第5期9卷 383-402页

作者： Sagardweep biswas Subrata Kundu Soujan Ghosh Swati Chowdhury Shih-Sian Yang Masashi Hayakawa Suman Chakraborty Sandip K. Chakrabarti sudipta Sasmal Indian Centre for Space Physics Kolkata India Institute of Space Science National Central University Chinese Taipei Hayakawa Institute of Seismo Electromagnetics Co. Ltd. UEC Alliance Center Chofu Tokyo Japan Physical Research Laboratory Navrangpura Ahmedabad India

Study of seismo-ionospheric coupling mechanism demands the quiet geomagnetic condition to eliminate any kind of contamination in the lower atmospheric and ionospheric parameters. In this manuscript, we present the effect of back to back two geomagnetic storms before a strong earthquake happened in Imphal, India on January 4, 2016 (M = 6.7). We studied the lower ionospheric irregularities for the duration of 31 days by computing the nighttime fluctuations in Very Low Frequency (VLF) radio signal received transmitter JJI (22.2 kHz) in Japan at Ionospheric and Earthquake Research Centre & Optical Observatory (IERCOO), Sitapur, India. We also studied the presence of Atmospheric Gravity Wave (AGW) in nighttime VLF signal in lower ionospheric heights and the same computed that from SABER/TIMED satellite. Two geomagnetic storms occurred on December 21, and 31, 2015. By the conventional analysis, we found that there is a significant decrease in nighttime trend and an increase in nighttime fluctuations around 15 days before the earthquake and just on the first storm and thus the pre-seismic effects on VLF signal gets contaminated due to the presence of storms. The wave-like structure in VLF fluctuations shows significant increase in intensity by using Fourier and Wavelet analysis before the earthquake. By analysis of SABER data, we found significant enhancement in AGW around 10 days before the earthquake. As the wavelike structures are coming from neutral acoustics reasons from pressure or temperature variations, this paper exhibits a significant example of contamination in ionospheric parameters due to geomagnetic storm where the acoustics parameters remain un-contaminated.

关键词： Very Low Frequency Wave Propagation Earthquake Precursory Atmospheric Gravity Wave Geomagnetic Strom SABER/TIMED