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Carbon-13 NMR Spectra of Sesquiterpene Lactones
Publisher Summary This chapter presents the carbon-13 nuclear magnetic resonance (NMR) data of sesquiterpene lactones. The structure classification and methods of structure determination are alsoExpand
Antimutagenic constituents from the thorns of Gleditsia sinensis.
Antimutagenic activity-guided fractionation of an extract prepared from the thorns of Gleditsia sinensis LAM. led to the isolation of one triterpenoid and four steroids, which were identified asExpand
Reinvestigation of the structural assignment of signals in the 1H and 13C NMR spectra of the flavone apigenin
The assignment of some 1H and 13C NMR chemical shifts of apigenin have been uncertain and even contradictory. A reinvestigation with recent NMR techniques has led to a new set of 13C NMR parametersExpand
Lasioglossins: Three Novel Antimicrobial Peptides from the Venom of the Eusocial Bee Lasioglossum laticeps (Hymenoptera: Halictidae)
Three novel structurally related pentadecapeptides, named lasioglossins, were isolated from the venom of the eusocial bee Lasioglossum laticeps and exhibited potent antimicrobial activity against both Gram‐positive and Gram‐negative bacteria, low haemolytic and mast cell degranulation activity, and a potency to kill various cancer cells in vitro. Expand
Conformational features of a synthetic cyclic peptide corresponding to the complete V3 loop of the RF HIV-1 strain in water and water/trifluoroethanol solutions.
The disulfide-bridge-closed cyclic peptide corresponding to the whole V3 loop of the RF HIV-1 strain was examined by proton two-dimensional NMR spectroscopy in water and water/trifluoroethanol solutions and the C-terminal helix is shown to have amphipathic character and might thus assist in the infection process. Expand
Trilobolide and related sesquiterpene lactones from Laser trilobum possessing immunobiological properties.
Results demonstrate that trilobolide and its acetoxy analog are strong activators of cytokine secretion and inhibitors of the cytokine and nitric oxide production. Expand
Nicotianamine, a possible phytosiderophore of general occurrence
Nicotianamine has an optimal molecular structure for chelating iron ions and is considered a possible phytosiderophore with an essential function in cellular iron transport and/or metabolism. Expand
Photochemical transformation of 20-hydroxyecdysone: production of monomeric and dimeric ecdysteroid analogues
The transformed dimeric analogue of 20-hydroxyecdysone retained the high agonistic activity on the ecdysone receptor in the B(II)-bioassay compared with the original 20E. Expand
Cholesteryl esters of ω-(O-acyl)-hydroxy fatty acids in vernix caseosa[S]
Cholesteryl esters of ω-(O-acyl)-hydroxy FAs (Chl-ωOAHFAs) were identified for the first time in vernix caseosa and characterized using chromatography and MS and their general structure was established using high-resolution and tandem MS of intact lipids, and products of their transesterification and derivatizations. Expand
The complete Consensus V3 loop peptide of the envelope protein gp120 of HIV‐1 shows pronounced helical character in solution
The disulfide bridge closed cyclic peptide corresponding to the whole Consensus V3 loop of the envelope protein gp120 of HIV‐1 was examined by proton 2D‐NMR spectroscopy in water and in a 20%Expand