1.  ‘Unveiling the physical evolution of molecular cores and our chemical heritage through a multidisciplinary approach’, National Astronomical Observatory of Japan(NAOJ), 13th March, 2021.

 

2.  ‘The earliest stage of stellar-multiples? -millimeter studies on evolution of molecular cores’, National Taiwan Normal University Colloquium, 23rd Feb., 2021

 

3. ‘The apparent chemical diversity and physical structure of the IRAS 4A proto-binary system’, CICO-VICO Fall 2020 Workshop, jointly organized by Chalmers University and University of Virginia, 14th-16th December.

 

4. ‘Physical and chemical  evolution  of  molecular clouds  down  to  protoplanetary  disk and our chemical origin’, Chalmers University of Technology colloquium, 25th November, 2020

 

5.‘From Hot-corinos to our chemical heritage; the case of NGC1333 IRAS 4A’, Astrochemistry Discussion (a  reputed  International  online  platform  of  astrochemist  all  over  the World), 7th October, 2020

 

6.‘Interstellar Molecules, evolution of Sun-like stars and our chemical origin’, Indian Center for Space Physics, Kolkata, India, 7th February, 2020

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7. A pristine protostellar jet-disk system: HH212, and chemical complexity in it, Astrochemistry in the THz domain, Chennai, India 30-31st Oct. 2017

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Contributed talk:

 

1. ‘Estimating the density profile of a highly dense prestellar core with compact structure ( 1000s au) in OMC from multi-scale observations’, East Asian ALMA conference, National  Astronomical  Observatory  of  Japan  (NAOJ)  (virtual);  18th-21th  Jan., 2022,

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2. ‘Detection of extremely high density compact structure of prestellar cores and multiple substructures within’, East Asian ALMA workshop organized by KASI, Korea; 17th- 19th Feb., 2021

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3. 'A Glycine isomer, methyl carbamate towards hot corion objects’, 43rd COSPAR Assembly, 28th Jan. - 4th Feb, 2021

 

4. ​‘Implications of a Hot Atmosphere/Corino from ALMA Observations toward NGC 1333 IRAS 4A1’ Astrochemical Frontiers Conference - Quarantine Edition,June 15- 19, 2020; Sponsored by IAU Commission H2 Steering Committee: E. Bergin (President), P. Caselli (Vice-President), J. Jorgensen (Secretary), & Y. Aikawa, M. Cunningham, W. Geppert, K.O¨ berg, T. Millar (Ex-officio).

 

5. ‘Constraints of the formation and abundances of methyl carbamate, a glycine isomer, in hot corinos’, The Astronomical Society of Republic of China (Taiwan) Meeting, ASIAA, Taiepi, 3-4 September, 2020.

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6. Deuteration in the outflows of low-mass protostar system, HH212: An ALMA observation of deuterated formaldehyde, COSPAR-2018, 14-22th July 2018, Pasadena, USA.

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7. Complex molecules and deuteration in a pristine jet-disk system HH212, COSPAR- 2018, 14-22th July 2018, Pasadena, USA.

 

8. Tracing the low-mass star formation; complex molecules and hot-corino, EXPUNIV- 2018, 14-17th Nov 2018, SNBNCBS, Kolkata, India.

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9. The Molecular Universe: study by means of modeling, experiment and observation, 4th April, 2017, Department of Physics, IISc, India.

 

10. Developing a 2D hydrodynamic code to study the formation of proto-star and the Chemical evolution of cloud, International work.shop on chemical evolution and origin of life, 21-23 rd march, 2013, IIT Roorke , india

 

11. Formation of H2 , D2 and HD on interstellar dust, Light Scattering technique and application to astronomy and other areas, 19-21st Nov, 2013, S N Bose National Centre for Basic Sciences, Kolkata, India.