Fractions of Acarus calamus oil obtained by vacuum liquid chromatography showed increased mosquito-larvicidal activity against III instar larvae of Culex quinquefasciatus from LCso' 39ppm in unfractionated oil to LCso,27ppm. ...

Relative geoid of central Sri Lanka has been calculated adding contributions due to the Bouguer anomaly and topographic features over the region. A Fourier technique which makes use of fast Fourier algorithms was used to ...

Sun drying of papain, the most commonly used method.in Sri Lanka was found to yield papain of inferior quality. Both oven drying and vacuum drying were found to be superior to sun drying. Vacuum drying yielded the highest ...