Browsing by Author "Sourav Chatterjee"

Now showing 1 - 3 of 3

Astrophysics with compact objects: An Indian perspective, present status and future vision
(Springer, 2025) Manjari Bagchi; Prasanta Bera; Aru Beri; Dipankar Bhattacharya; Bhaswati Bhattacharyya; Sudip Bhattacharyya; Manoneeta Chakraborty; Debarati Chatterjee; Sourav Chatterjee; Indranil Chattopadhyay; Santabrata Das; Sushan Konar; Pratik Majumdar; Ranjeev Misra; Arunava Mukherjee; Banibrata Mukhopadhyay; Mayukh Pahari; Krishna Kumar Singh; Mayuresh P. Surnis; Firoza K. Sutaria; Shriharsh P. Tendulkar
Astrophysical compact objects, viz., white dwarfs, neutron stars and black holes, are the remnants of stellar deaths at the end of their life cycles. They are ideal testbeds for various fundamental physical processes under extreme conditions that are unique in nature. Observational radio astronomy with uGMRT and OORT facilities has led to several important breakthroughs in studies of different kinds of pulsars and their emission mechanisms. On the other hand, accretion processes around compact objects are at the core of Indian astronomy research. In this context, AstroSat mission revolutionized spectro-temporal observations and measurements of accretion phenomena, quasi-periodic oscillations, and jet behaviour in binary systems hosting compact objects. Moreover, recently launched XPoSat mission is set to provide an impetus to these high-energy phenomena around compact objects by enabling us to conduct polarization measurements in the X-ray band. Further, during the past decade, numerous gravitational wave signals have been observed from coalescing black holes and neutron stars in binary systems. Recent simultaneous observation of GW170817 event in both gravitational waves and electromagnetic channels has ushered in the era of multi-messenger astronomy. In the future, synergistic efforts among several world-class observational facilities, e.g., LIGO-India, SKA, TMT, etc., within the Indian astrophysics community will provide a significant boost to achieve several key science goals that have been delineated here. In general, this paper plans to highlight scientific projects being pursued across Indian institutions in this field, the scientific challenges that this community would be focusing, and the opportunities available in the coming decade. Finally, we have also mentioned the required resources, both in the form of infrastructural and human resources. © Indian Academy of Sciences 2025.
Syntheses and characterization of mononuclear Zn(II), Cd(II) and Hg(II) complexes of 2-[(3,5-dibromo-2-hydroxy-benzylidene)-amino]-2-hydroxymethyl-propane-1,3-diol: Photoluminescence properties and DFT study
(Elsevier S.A., 2018) Sourav Chatterjee; Ishani Majumder; Aratrika Chakraborty; Madhulata Shukla; Tanmay Chattopadhyay
A new Schiff-base ligand HL ((2-[(3,5-dibromo-2-hydroxy-benzylidene)-amino]-2-hydroxymethyl-propane-1,3-diol)) was obtained by the 1:1 condensation of 1,3-dibromo salicylaldehyde and (tris hydroxy methyl) amino methane. Then three new complexes, [Zn(L)2], [Cd(L)2] and [Hg(L)2], have been prepared by the reaction of zinc(II), cadmium(II) and mercury(II) chlorides with the ligand and characterized by routine physicochemical techniques. Complex 1 has further been characterized by single crystal X-ray structural analyses. The ligands, as well as all three complexes, are highly fluorescent. For the ligand, the emission band is attributed to a π → π∗ transition, whereas for the complexes the emissions may be assigned to ligand-to-metal charge transfers (LMCT). DFT calculation of all the three complexes has also been done. © 2017 Elsevier B.V.
Whole mount in situ localization of miRNAs and target mRNA transcripts in plants
(Springer Verlag, 2019) Vibhav Gautam; Archita Singh; Swati Verma; Sharmila Singh; Sourav Chatterjee; Ananda K. Sarkar
The functional characterization of miRNAs often involves understanding of their spatiotemporal expression, which mostly relies on reporter-based or in situ hybridization studies. The available in situ localization methods follow separate protocols for pre-hybridization, hybridization, post-hybridization, and detection steps for both miRNA and mRNA transcripts in plants. In this study, we present a single method which can be used for whole mount in situ localization of both miRNAs and mRNAs in different plant tissues. Our modified method provides enhanced sensitivity for the localization of miRNA and their target transcripts. Consequently, a less laborious, time-saving, economic and efficient method has been proposed by the modification of pre-hybridization, hybridization, post-hybridization and detection steps. © 2019, King Abdulaziz City for Science and Technology.