The hydro-distilled essential oil from the fresh aerial part of Orchidantha vietnamica K. Larsen collected from Lamdong-Vietnam was analyzed by GC-FID (Gas Chromatography-Flame Ionization Detection) and GC-MS (Gas Chromatography-Mass Spectroscopy) for the first time. The oil was characterized by the presence of volatile compounds type terpenoids, in which oxygenated monoterpenes (30.04 %) and sesquiterpene hydrocarbons (37.32 %) are the major components. The oxygenated monoterpene linalool reached the highest percentage of 16.66 %, followed by the sesquiterpene hydrocarbons (E)-caryophyllene (11.4 %), α-humulene (8.00 %), and bicyclogermacrene (6.93 %). Monoterpene hydrocarbons, oxygenated sesquiterpenoids, oxygenated diterpenes, carotenoids, and others are also detected in this oil (< 3.00 %). The essential oil of O. vietnamica aerial part showed antimicrobial activity against two pathogenic bacterial strains Escherichia coli ATCC 8739 and Candida albicans ATCC 10231 with the same MIC (Minimum Inhibitory Concentration) value of 200 µg/mL.

The paper presents the situation of using the natural playground in outdoor play of preschool children in kindergartens in Cao Lanh, Dong Thap. The study shows that many preschool teachers in Cao Lanh have not used natural playgrounds to organize outdoor activities for preschoolers. The paper also analyzes the actual causes and discusses the direction of the measures. Research data was conducted on 10 preschools in the region with 199 teachers.