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E-learning plays a key enabling role in knowledge management for individuals, schools, and enterprises. Nevertheless, the lack of standards in content and learning management systems (LMSs) makes the reusability and interoperability of learning resources infeasible. The emergence of the SCORM specification has shed light on the standardization of(More)
Four new endiandric acid analogues, tsangibeilin C (1), tsangibeilin D (2), tricyclotsangibeilin (3) and endiandric acid M (4), one new lignan, beilschminol B (5) and two new sesquiterpenes, (+)-5-hydroxybarbatenal (6) and (4R,5R)-4,5-dihydroxycaryophyll-8(13)-ene (7), together with four known compounds (8-11), were isolated from the roots of Beilschmiedia(More)
Since the emergence of the SCORM specification, e-learning has received more and more attentions in recent years. It plays the key-enabling role in knowledge management for individual, schools, and enterprises. The most salient features of SCORM come from its goal, namely, reusability, accessibility, interoperability, and durability. One of the underlying(More)
The fruits of Persea americana (Avocado) are nowadays used as healthy fruits in the world. Bioassay-guided fractionation of the active ethyl acetate soluble fraction has led to the isolation of five new fatty alcohol derivatives, avocadenols A-D (1-4) and avocadoin (5) from the unripe pulp of P. americana, along with 12 known compounds (6-17). These(More)
Bioassay-guided fractionation of the methanolic extract of the stem of Pisonia umbellifera (Nyctaginaceae) afforded the three new compounds, secopisonic acid (1), 6,8-dimethylisogenistein (2), and (+)- ENT-ficusol (3), and four first isolates from nature, pisoninol I (4), pisoninol II (5), pisoquinoline (6), and pisodienone (7), together with fifteen known(More)
Bioassay-guided fractionation of the methanolic extract of the root of Ehretia longiflora (Boraginaceae) afforded eight compounds, ehretiquinone (1), ehretiolide (2), ehreticoumarin (3), ehretilactone A (4), ehretilactone B (5), ehretiamide (6), ehretine (7), and ehretiate (8), together with 12 known compounds (9-20). The relative configuration of 1 was(More)
Seven sesquiterpenoids, hiiranlactones A-D (1-4), (-)-ent-6α-methoxyeudesm-4(15)-en-1β-ol (5), (+)-villosine (6), hiiranepoxide (7), and one triterpenoid, hiiranterpenone (8), together with 22 known compounds, were isolated from the leaves of Neolitsea hiiranensis (Lauraceae). Their structures were elucidated by spectroscopic analysis and single crystal(More)
Bioassay-guided fractionation of the root tissue of Reevesia formosana led to isolation of 13 cardenolide glycosides, reevesiosides A-I and epi-reevesiosides F-I. Their structures were determined by means of spectroscopic analysis and single-crystal X-ray diffraction was performed using reevesioside A. Reevesioside A, reevesioside F, and epi-reevesioside F(More)
Bioassay-guided fractionation of the methanolic extract of the roots of Rhaphiolepis indica var. tashiroi afforded four new dibenzofurans, 2-hydroxy-3,4,6-trimethoxydibenzofuran (1), 2-hydroxy-3,4,9-trimethoxydibenzofuran (2), 2-hydroxy-3,4,6,9-tetramethoxydibenzofuran (3), and 1,2-methylenedioxy-3,4,6-trimethoxydibenzofuran (4), two new biphenyls,(More)
Bioassay-guided fractionation of the roots of Neolitsea daibuensis afforded three new β-carboline alkaloids, daibucarbolines A-C (1-3), three new sesquiterpenoids, daibulactones A and B (4 and 5) and daibuoxide (6), and 20 known compounds. The structures of 1-6 were determined by spectroscopic analysis and single-crystal X-ray diffraction. Daibucarboline A(More)