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Article
Kramers’ problem and the Knudsen minimum: a theoretical analysis using a linearized 26-moment approach
A set of linearized 26 moment equations, along with their wall boundary conditions, are derived and used to study low-speed gas flows dominated by Knudsen layers. Analytical solutions are obtained for Kramers’...
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Article
A piperidine alkaloid and limonoids from Arisaema decipiens, a traditional antitumor herb used by the dong people
A new piperidine alkaloid and three known tetranortriterpenoids were isolated from the methanol extracts of the rhizomes of Arisaema decipiens Schott (Araceae) and their chemical structures were identified as (−)...
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Article
Carboxymethyl flavonoids and a monoterpene glucoside from Selaginella moellendorffii
A new dihydroflavone, 5-carboxymethyl-7,4′-dihydroxyflavonone (1), and its glucoside 5-carboxymethyl-7,4′-dihydroxyflavonone-7-O-β-d-glucopyranoside (2), and one new monoterpene glucoside, (4Z,6E)-2,7-dimethyl-8-...
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Article
Open AccessLimonoids and triterpenoids from the twigs and leaves of Dysoxylum hainanense
Four new limonoids, dysohainanins A–D (1–4), and two new triterpenoids, dysohainanins E and F (5 and 6), together with seven known ones were isolated from the twigs and leaves of Dysoxylum hainanense Merr. The st...
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Article
Open AccessTwo new tirucallane triterpenoids from Aphanamixis grandifolia
Two new tirucallane triterpenoids, 2 α-ethoxy-2,3-secotirucalla-2,29-epoxy-7-ene-23-oxo-3-oic acid (1) and (23E)-2 α-hydroxytirucalla-7,23,25-triene-3-one (2), along with the known 2,3-secotirucalla-2,3;2,29-diep...
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Article
Acid condensation and heat transfer characteristics on H-type fin surface with bleeding dimples and longitudinal vortex generators
Acid condensation rate is an important factor denoting the acid corrosion, and the reduction of the acid condensation can significantly relieve the acid corrosive effect on the wall surface and improve the sec...
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Article
Open AccessPsiguajadials A–K: Unusual Psidium Meroterpenoids as Phosphodiesterase-4 Inhibitors from the Leaves of Psidium guajava
Bioassay-guided fractionation of the ethanolic extract of the leaves of Psidium guajava led to the isolation of 11 new Psidium meroterpenoids, psiguajadials A–K (1–11), along with 17 known ones (12–28). Their str...
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Article
Natural product-based screening led to the discovery of a novel PXR agonist with anti-cholestasis activity
Cholestasis is a major cause of a series of bile flow malfunction-related liver diseases. Pregnane X receptor (PXR) is a key regulator in endo- and xeno-biotics metabolism, which has been considered as a promi...
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Article
Open AccessMulberry Diels–Alder-type adducts: isolation, structure, bioactivity, and synthesis
Mulberry Diels–Alder-type adducts (MDAAs) are unique phenolic natural products biosynthetically derived from the intermolecular [4 + 2]-cycloaddition of dienophiles (mainly chalcones) and dehydroprenylphenol d...
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Article
Open AccessFive new limonoids isolated from Walsura robusta
Five new toosendanin limonoids with highly oxidative furan ring walsurobustones A-D (1–4), and one new furan ring degraded limonoid walsurobustone E (5) together with one known compound toonapubesic acid B (6) we...
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Article
Open AccessNew halimane and clerodane diterpenoids from Croton cnidophyllus
Three new halimane furanoditerpenoids (1–3) and three new clerodane furanoditerpenoids (4–6), along with seven known terpenoids including four pimarane diterpenoids (7–10) and three norisoprenoids (11–13) were is...