@article {WEIDENHAMER:1993p1096, title = {JUST HOW INSOLUBLE ARE MONOTERPENES}, journal = {J Chem Ecol}, volume = {19}, number = {8}, year = {1993}, month = {Jan}, pages = {1799{\textendash}1807}, abstract = {Prior generalizations about the ecological roles of monoterpenes may be misleading if based on the presumed insolubility of monoterpenes in water. We determined the aqueous solubility of 31 biologically active monoterpenes by gas chromatography. While hydrocarbons were of low solubility (< 35 ppm), oxygenated monoterpenes exhibited solubilities one or two orders of magnitude higher, with ranges of 155-6990 ppm for ketones and of 183-1360 ppm for alcohols. Many monoterpenes are phytotoxic in concentrations under 100 ppm, well below the saturated aqueous concentrations of oxygenated monoterpenes. Therefore, even dilute, unsaturated solutions of monoterpenes, occurring naturally in plant tissues and soil solutions, may act as potent biological inhibitors.}, keywords = {Allelopathy, Borneol, Calamintha-Ashei, Camphor, Conradina-Canescens, Florida Scrub Community, Grasses, Juglone, Menthofurans, Monoterpenes, Shrub, Solubility, Ursolic Acid}, url = {http://apps.isiknowledge.com/InboundService.do?product=WOS\&action=retrieve\&SrcApp=Papers\&UT=A1993LT33800016\&SID=2AFL5dnj5MCc8JPedL5\&SrcAuth=mekentosj\&mode=FullRecord\&customersID=mekentosj\&DestFail=http\%253A\%252F\%252Faccess.isiproducts.com\%252Fcustom_image}, author = {JD WEIDENHAMER and FA MACIAS and NH FISCHER and GB WILLIAMSON} } @article {FISCHER:1994p1095, title = {IN SEARCH OF ALLELOPATHY IN THE FLORIDA SCRUB - THE ROLE OF TERPENOIDS}, journal = {J Chem Ecol}, volume = {20}, number = {6}, year = {1994}, month = {Jan}, pages = {1355{\textendash}1380}, abstract = {The hypothesis was tested that allelopathic agents released from fire-sensitive plants of the Florida scrub community deter the invasion of fire-prone sandhill grasses. The structures of the constituents of four endemic scrub species, Conradina canescens, Calamintha ashei, Chrysoma pauciflosculosa, culosa, and Ceratiola ericiodes, were established and their phytotoxic activity against two grasses of the sandhill was examined. Effects of the secondary metabolites from the above scrub species and their degradation products upon the germination and radicle growth of little bluestem (Schizachyrium scoparium) and green sprangletop (Leptochloa dubia), two native grasses of the Florida sandhill community, were determined. The studies included determination of the water solubility and release mechanism of terpenes and other allelopathic agents from the source plants and their aqueous transport to the target species. Some of the natural products were nontoxic until activated by light and/or oxidation after release from the source plant into the environment.}, keywords = {Activation, Allelochemicals, Allelopathy, Calamintha-Ashei, Calamintha-Ashei (Labiatae), Ceratiola-Ericiodes (Empetraceae), Chrysoma-Pauciflosculosa, Chrysoma-Pauciflosculosa (Asteraceae), Conradina-Canescens (Labiatae), Ferulic Acid, Inhibition, Ion Uptake, Mechanisms Of Release, Phenolic-Acids, Pines, Schizachyrium-Scoparium, Sesquiterpene Lactones, Terpenoids, Water Transport}, url = {http://apps.isiknowledge.com/InboundService.do?product=WOS\&action=retrieve\&SrcApp=Papers\&UT=A1994NR93800005\&SID=2AFL5dnj5MCc8JPedL5\&SrcAuth=mekentosj\&mode=FullRecord\&customersID=mekentosj\&DestFail=http\%253A\%252F\%252Faccess.isiproducts.com\%252Fcustom_image}, author = {NH FISCHER and GB WILLIAMSON and JD WEIDENHAMER and DR RICHARDSON} }