Holothuria atra: An Underutilized Marine Resource for Nutritional and Collagen Benefits

Nishani Jayanika Jayathilake, Nipuna Deelaka Wimalagunarathna, Isuru Wijesekara , Varuni Karunika Gunathilake

Published in Asian Journal of Biotechnology and Bioresource Technology

The results showed that body wall tissues of H.atra contained high moisture level (83.2%), proteins (10.2%) and low levels of fat (2.0%) and carbohydrates (2.1%). Further, flesh contains, 0.4% saturated fatty acids, 0.4% unsaturated fatty acids, considerable amount of Calcium, Magnesium and Sodium. Collagen yield from the body wall was recorded as 0.95% and fibrils observed as irregular and dense with a loose and porous structure. Attenuate Total Reflectance-Fourier Transform Infrared Spectroscopy and Ultra Violet Vis spectroscopy indicated the collagen was Type I.


Chemical composition and biological efficacy of Acorus calamus (L.) rhizome essential oil on Sitophilus oryzae (L.), Rhyzopertha dominica (F.), and Oryzaephilus surinamensis (L.) as stored-grain protectants

S.S. Wijerathna, A.G.W.U. Perera, S.D.M. Chinthaka

Published in Biocatalysis and Agricultural Biotechnology

Highlights of the research

  • Acorus calamus essential oil was toxic to S. oryzae, R. dominica, O. surinamensis.
  • α-Asarone enriched oil produced significant repellency on test insects in an hour.
  • Botanical was a potent feeding deterrent against S. oryzae, and R. dominica in 72 h.
  • The essential oil induced phagostimulant activity against O. surinamensis adults.
  • A. calamus oil caused severe ultrastructural impacts on insects’ cuticular surfaces.

Molecular Genetics and Recombinant DNA Technology Workshop for A/L students

From exploring the fundamentals of molecular genetics to understanding the applications of recombinant DNA technology, participants were exposed to a wide array of topics, fostering a deeper appreciation for the wonders of modern biotechnology.

We extend our heartfelt gratitude to everyone who contributed to the success of this workshop. Special thanks to Dr. Sachini Fernando Meth Madurangi, Dilekha Hegoda, Anushka Mendis, Sachini Upeka, Suwani Mithsuki, Ranthilini C Banduwardena and Amila Vimarshana Jayaweera, whose tireless efforts made this educational endeavor possible.

Photo credits – Nipuna Deelaka Wimalagunarathna