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Barman D, Annadhasan M, Bidkar AP, Rajamalli P, Barman D, Ghosh SS, Chandrasekar R, Iyer PK. Highly efficient color-tunable organic co-crystals unveiling polymorphism, isomerism, delayed fluorescence for optical waveguides and cell-imaging. Nat Commun 2023; 14:6648. [PMID: 37863932 PMCID: PMC10589249 DOI: 10.1038/s41467-023-42017-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2023] [Accepted: 09/27/2023] [Indexed: 10/22/2023] Open
Abstract
Photofunctional co-crystal engineering strategies based on donor-acceptor π-conjugated system facilitates expedient molecular packing, consistent morphology, and switchable optical properties, conferring synergic 'structure-property relationship' for optoelectronic and biological functions. In this work, a series of organic co-crystals were formulated using a twisted aromatic hydrocarbon (TAH) donor and three diverse planar acceptors, resulting in color-tunable solid and aggregated state emission via variable packing and through-space charge-transfer interactions. While, adjusting the strength of acceptors, a structural transformation into hybrid stacking modes ultimately results in color-specific polymorphs, a configurational cis-isomer with very high photoluminescence quantum yield. The cis-isomeric co-crystal exhibits triplet-harvesting thermally activated delayed fluorescence (TADF) characteristics, presenting a key discovery in hydrocarbon-based multicomponent systems. Further, 1D-microrod-shaped co-crystal acts as an efficient photon-transducing optical waveguides, and their excellent dispersibility in water endows efficient cellular internalization with bright cell imaging performances. These salient approaches may open more avenues for the design and applications of TAH based co-crystals.
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Affiliation(s)
- Debasish Barman
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, 781039, India
| | - Mari Annadhasan
- School of Chemistry, and Centre for Nanotechnology University of Hyderabad, Gachibowli, Prof. C. R. Rao Road, Hyderabad, 500046, India
| | - Anil Parsram Bidkar
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, San Francisco, CA, 94143, USA
| | | | - Debika Barman
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, 781039, India
| | - Siddhartha Sankar Ghosh
- Department of Biosciences and Bioengineering IIT Guwahati, Guwahati, Assam, India.
- Centre for Nanotechnology, Indian Institute of Technology Guwahati, Guwahati, 781039, India.
| | - Rajadurai Chandrasekar
- School of Chemistry, and Centre for Nanotechnology University of Hyderabad, Gachibowli, Prof. C. R. Rao Road, Hyderabad, 500046, India.
| | - Parameswar Krishnan Iyer
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, 781039, India.
- Centre for Nanotechnology, Indian Institute of Technology Guwahati, Guwahati, 781039, India.
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2
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Chatterjee S, Dandu M, Dasika P, Biswas R, Das S, Watanabe K, Taniguchi T, Raghunathan V, Majumdar K. Harmonic to anharmonic tuning of moiré potential leading to unconventional Stark effect and giant dipolar repulsion in WS 2/WSe 2 heterobilayer. Nat Commun 2023; 14:4679. [PMID: 37542024 PMCID: PMC10403536 DOI: 10.1038/s41467-023-40329-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2023] [Accepted: 07/24/2023] [Indexed: 08/06/2023] Open
Abstract
Excitonic states trapped in harmonic moiré wells of twisted heterobilayers is an intriguing testbed for exploring many-body physics. However, the moiré potential is primarily governed by the twist angle, and its dynamic tuning remains a challenge. Here we demonstrate anharmonic tuning of moiré potential in a WS2/WSe2 heterobilayer through gate voltage and optical power. A gate voltage can result in a local in-plane perturbing field with odd parity around the high-symmetry points. This allows us to simultaneously observe the first (linear) and second (parabolic) order Stark shift for the ground state and first excited state, respectively, of the moiré trapped exciton - an effect opposite to conventional quantum-confined Stark shift. Depending on the degree of confinement, these excitons exhibit up to twenty-fold gate-tunability in the lifetime (100 to 5 ns). Also, exciton localization dependent dipolar repulsion leads to an optical power-induced blueshift of ~ 1 meV/μW - a five-fold enhancement over previous reports.
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Affiliation(s)
- Suman Chatterjee
- Department of Electrical Communication Engineering, Indian Institute of Science, Bangalore, 560012, India
| | - Medha Dandu
- Department of Electrical Communication Engineering, Indian Institute of Science, Bangalore, 560012, India
- Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Pushkar Dasika
- Department of Electrical Communication Engineering, Indian Institute of Science, Bangalore, 560012, India
| | - Rabindra Biswas
- Department of Electrical Communication Engineering, Indian Institute of Science, Bangalore, 560012, India
| | - Sarthak Das
- Department of Electrical Communication Engineering, Indian Institute of Science, Bangalore, 560012, India
- Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), Singapore, 138634, Republic of Singapore
| | - Kenji Watanabe
- Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba, 305-044, Japan
| | - Takashi Taniguchi
- International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba, 305-044, Japan
| | - Varun Raghunathan
- Department of Electrical Communication Engineering, Indian Institute of Science, Bangalore, 560012, India
| | - Kausik Majumdar
- Department of Electrical Communication Engineering, Indian Institute of Science, Bangalore, 560012, India.
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3
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Singh AK, Laskar R, Banerjee A, Mondal RK, Gupta B, Deb S, Dutta S, Patra S, Ghosh T, Sarkar S, Ghosh S, Bhattacharya S, Roy D, Chakraborty A, Chowdhury M, Mahaptra S, Paul A, Mazumder A, Chowdhury A, Chatterjee SS, Sarkar A, Ray R, Pal K, Jana A, Barik G, Ganguly S, Chatterjee M, Majhi D, Bandopadhyay B, Das S, Maitra A, Biswas NK. Contrasting Distribution of SARS-CoV-2 Lineages across Multiple Rounds of Pandemic Waves in West Bengal, the Gateway of East and North-East States of India. Microbiol Spectr 2022; 10:e0091422. [PMID: 35852336 PMCID: PMC9430150 DOI: 10.1128/spectrum.00914-22] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2022] [Accepted: 06/29/2022] [Indexed: 11/20/2022] Open
Abstract
The evolution of viral variants and their impact on viral transmission have been an area of considerable importance in this pandemic of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). We analyzed the viral variants in different phases of the pandemic in West Bengal, a state in India that is important geographically, and compared the variants with other states like Delhi, Maharashtra, and Karnataka, located in other regions of the country. We have identified 57 pango-lineages in 3,198 SARS-CoV-2 genomes, alteration in their distribution, as well as contrasting profiles of amino acid mutational dynamics across different waves in different states. The evolving characteristics of Delta (B.1.617.2) sublineages and alterations in hydrophobicity profiles of the viral proteins caused by these mutations were also studied. Additionally, implications of predictive host miRNA binding/unbinding to emerging spike or nucleocapsid mutations were highlighted. Our results throw considerable light on interesting aspects of the viral genomic variation and provide valuable information for improved understanding of wave-defining mutations in unfolding the pandemic. IMPORTANCE Multiple waves of infection were observed in many states in India during the coronavirus disease 2019 (COVID19) pandemic. Fine-scale evolution of major SARS-CoV-2 lineages and sublineages during four wave-window categories: Pre-Wave 1, Wave 1, Pre-Wave 2, and Wave 2 in four major states of India: Delhi (North), Maharashtra (West), Karnataka (South), and West Bengal (East) was studied using large-scale virus genome sequencing data. Our comprehensive analysis reveals contrasting molecular profiles of the wave-defining mutations and their implications in host miRNA binding/unbinding of the lineages in the major states of India.
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Affiliation(s)
- Animesh K. Singh
- National Institute of Biomedical Genomics, Kalyani, West Bengal, India
| | | | - Anindita Banerjee
- National Institute of Biomedical Genomics, Kalyani, West Bengal, India
| | | | - Bishal Gupta
- School of Tropical Medicine, Kolkata, West Bengal, India
| | - Sonia Deb
- School of Tropical Medicine, Kolkata, West Bengal, India
| | - Shreelekha Dutta
- National Institute of Biomedical Genomics, Kalyani, West Bengal, India
| | - Subrata Patra
- National Institute of Biomedical Genomics, Kalyani, West Bengal, India
| | - Trinath Ghosh
- National Institute of Biomedical Genomics, Kalyani, West Bengal, India
| | - Sumanta Sarkar
- National Institute of Biomedical Genomics, Kalyani, West Bengal, India
| | - Shekhar Ghosh
- National Institute of Biomedical Genomics, Kalyani, West Bengal, India
| | | | - Debojyoti Roy
- National Institute of Biomedical Genomics, Kalyani, West Bengal, India
| | | | - Meghna Chowdhury
- National Institute of Biomedical Genomics, Kalyani, West Bengal, India
| | - Surajit Mahaptra
- National Institute of Biomedical Genomics, Kalyani, West Bengal, India
| | - Antara Paul
- National Institute of Biomedical Genomics, Kalyani, West Bengal, India
| | - Anup Mazumder
- National Institute of Biomedical Genomics, Kalyani, West Bengal, India
| | | | | | | | - Raja Ray
- Institute of Post-Graduate Medical Education and Research, Kolkata, West Bengal, India
| | - Kuhu Pal
- College of Medicine and JNM Hospital, Kalyani, West Bengal, India
| | - Angshuman Jana
- Bankura Sammilani Medical College, Bankura, West Bengal, India
| | - Goutam Barik
- Medical College and Hospital, Kolkata, West Bengal, India
| | - Swagata Ganguly
- Nil Ratan Sircar Medical College and Hospital, Kolkata, West Bengal, India
| | | | - Dipankar Majhi
- Department of Health and Family Welfare, Government of West Bengal, Kolkata, West Bengal, India
| | | | - Saumitra Das
- National Institute of Biomedical Genomics, Kalyani, West Bengal, India
| | - Arindam Maitra
- National Institute of Biomedical Genomics, Kalyani, West Bengal, India
| | - Nidhan K. Biswas
- National Institute of Biomedical Genomics, Kalyani, West Bengal, India
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Mitra S, Roy N, Maity S, Bandyopadhyay D. Multimodal chemo-/magneto-/phototaxis of 3G CNT-bots to power fuel cells. Microsyst Nanoeng 2020; 6:19. [PMID: 34567634 PMCID: PMC8433207 DOI: 10.1038/s41378-019-0122-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/24/2019] [Revised: 11/09/2019] [Accepted: 11/15/2019] [Indexed: 06/13/2023]
Abstract
We report the development of a 3G microswimmer, namely, CNT-bot, capable of undergoing acid-, alkali-, magneto- and phototaxis inside acidic or alkaline baths of peroxide fuel and/or water. The use of carboxyl-functionalised multi-walled carbon nanotubes (MWCNTs) facilitated the propulsion of CNT-bots in an alkaline-water solution by ejecting carbon-dioxide bubbles. Furthermore, doping of magnetite nanoparticles (FeONPs), ferrous ions (Fe2+) and titanium dioxide nanoparticles (TiONPs) induces magnetic, chemical and photonic modes of propulsion. While FeONPs stimulated magnetotaxis at a rate of up to ~10 body lengths per second under the influence of a bar magnet, chemotaxis of a similar speed in a peroxide fuel was achieved by bubble-propulsion of oxygen gas originating from the Fenton reaction. In addition, the light-stimulated photo-Fenton reaction led to phototaxis of CNT-bots. A thin coating of magnesium imparted a half-faced Janus appearance to the CNT-bots, which facilitated motion in normal or acidic water media through the ejection of hydrogen gas bubbles. This chemotaxis could be transformed into pH-stimulated directional motion by establishing an acid or alkali concentration gradient across the peroxide and/or water baths. The capacity of CNT-bots to produce oxygen (hydrogen) bubbles in peroxide (acidic water) fuel was exploited to power a PEM fuel cell to generate electricity. The pure oxygen and hydrogen gases generated by CNT-bots in separate chambers were fed directly into the fuel cell in which the incessant motions of the particle facilitated the creation and release of the pure gases to achieve on-demand electricity generation. The motor could also induce dye degradation through advanced oxidation owing to the production of intermediate hydroxyl radicals during the Fenton reaction.
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Affiliation(s)
- Shirsendu Mitra
- Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati, Assam 781039 India
| | - Nirmal Roy
- Centre for Nanotechnology, Indian Institute of Technology Guwahati, Guwahati, Assam 781039 India
| | - Surjendu Maity
- Centre for Nanotechnology, Indian Institute of Technology Guwahati, Guwahati, Assam 781039 India
| | - Dipankar Bandyopadhyay
- Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati, Assam 781039 India
- Centre for Nanotechnology, Indian Institute of Technology Guwahati, Guwahati, Assam 781039 India
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Abstract
In the field of computational bioinformatics, identifying a set of genes which are responsible for a particular cellular mechanism, is very much essential for tasks such as medical diagnosis or disease gene identification. Accurately grouping (clustering) the genes is one of the important tasks in understanding the functionalities of the disease genes. In this regard, ensemble clustering becomes a promising approach to combine different clustering solutions to generate almost accurate gene partitioning. Recently, researchers have used generative model as a smart ensemble method to produce the right consensus solution. In the current paper, we develop a protein-protein interaction-based generative model that can efficiently perform a gene clustering. Utilizing protein interaction information as the generative model's latent variable enables enhance the generative model's efficiency in inferring final probabilistic labels. The proposed generative model utilizes different weak supervision sources rather utilizing any ground truth information. For weak supervision sources, we use a multi-objective optimization based clustering technique together with the world's largest gene ontology based knowledge-base named Gene Ontology Consortium(GOC). These weakly supervised labels are supplied to a generative model that eventually assigns all genes to probabilistic labels. The comparative study with respect to silhouette score, Biological Homogeneity Index (BHI) and Biological Stability Index (BSI) proves that the proposed generative model outperforms than other state-of-the-art techniques.
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Affiliation(s)
- Pratik Dutta
- Department of Computer Science and Engineering, Indian Institute of Technology Patna, Bihta, 801103, India.
| | - Sriparna Saha
- Department of Computer Science and Engineering, Indian Institute of Technology Patna, Bihta, 801103, India
| | - Sanket Pai
- Department of Chemical Science and Technology, Indian Institute of Technology Patna, Bihta, 801103, India
| | - Aviral Kumar
- Department of Chemical Science and Technology, Indian Institute of Technology Patna, Bihta, 801103, India
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Abstract
Manipulation of colloidal objects with light is important in diverse fields. While performance of traditional optical tweezers is restricted by the diffraction-limit, recent approaches based on plasmonic tweezers allow higher trapping efficiency at lower optical powers but suffer from the disadvantage that plasmonic nanostructures are fixed in space, which limits the speed and versatility of the trapping process. As we show here, plasmonic nanodisks fabricated over dielectric microrods provide a promising approach toward optical nanomanipulation: these hybrid structures can be maneuvered by conventional optical tweezers and simultaneously generate strongly confined optical near-fields in their vicinity, functioning as near-field traps themselves for colloids as small as 40 nm. The colloidal tweezers can be used to transport nanoscale cargo even in ionic solutions at optical intensities lower than the damage threshold of living micro-organisms, and in addition, allow parallel and independently controlled manipulation of different types of colloids, including fluorescent nanodiamonds and magnetic nanoparticles.
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Affiliation(s)
- Souvik Ghosh
- Centre for Nano Science and Engineering, Indian Institute of Science, Bangalore, 560012, India
| | - Ambarish Ghosh
- Centre for Nano Science and Engineering, Indian Institute of Science, Bangalore, 560012, India.
- Department of Physics, Indian Institute of Science, Bangalore, 560012, India.
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