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4-Hydroxyphenylpropan-7,8-diols and derivatives from Narvalina domingensis
(Phytochemistry, 1996)
Investigation of a Haitian medicinal plant, Narvalina domingensis, afforded, erythro- and threo-4-hydroxyphenylpropan-7,8-diol and their 7-O- methyl ether, 7-O-ethyl ethers and 4-O-isovaleric acid esters. The structures ...
Adaptive digital access protocol: a MAC protocol for multiservice broadband access networks
(IEEE Communications Magazine, 1996-03)
The authors describe a protocol that can adapt to the changing demands of a mix of synchronous transfer mode (STM) and asynchronous transfer mode (ATM) applications and efficiently allocate bandwidth to a variety of bursty ...
Levels of chlorinated hydrocarbons and trace metals in bivalves and nearshore sediments from the Dominican Republic
(Marine Pollution Bulletin, 1998-12)
Bivalves (Crassostrea rizhophorae, Isognomon alatus, Codakia orbicularis Linné, and Tellina fausta) and sediment samples collected from 12 locations along the Dominican Republic coastline were used to assess the degree of ...
Trace element determination of mercury by total-reflection X-ray fluorescence
(Spectrochimica Acta Part B: Atomic Spectroscopy, 1997-07-01)
A rapid and simple method is presented for the determination of trace amounts of ionic mercury in solutions by total-reflection X-ray fluorescence. The method relies on the formation of a mercury amalgam on a 50 nm thick ...
Determination of traces of heavy metals in estuarine waters of Barbacoas Bay, Colombia, by X-Ray fluorescence spectrometry
(1998-12-04)
An evaluation of metal contamination in estuarine waters and shrimp culture systems was conducted using two analytical processes: soluble metals were examined by radioisotope x-ray fluorescence spectrometry (RIXRF) and ...
Ingol diterpene ester from the latex of Euphorbia lactea
(Fitoterapia, 1999-04)
The stereochemistry of the ingol diterpene 3,12-di-O-acetyl-8-O-tigloyl-ingol (1), isolated from the latex of Euphorbia lactea, was determined by one- and two-dimensional NMR analysis.