RESUMEN
1-Phenylhepta-1,3,5-triyne (1), 5-phenyl-2-(1'-propynyl)-thiophene (2), and 2-(3'-acetoxy-1'-propynyl)-5-phenylthiophene (3) were isolated from Coreopsis lanceolata L., and their structures identified by spectroscopic methods. Compounds 1 and 2 showed effective nematicidal activities against Bursaphelenchus xylophilus and Caenorhabditis elegans, but had hardly any effect against Pratylenchus penetrans. Compound 3 did not show any effective nematicidal activity.
Asunto(s)
Antinematodos/toxicidad , Coreopsis/química , Nematodos/efectos de los fármacos , Acetileno/química , Acetileno/aislamiento & purificación , Acetileno/toxicidad , Animales , Antinematodos/química , Antinematodos/aislamiento & purificación , Caenorhabditis elegans/efectos de los fármacos , Echinochloa/crecimiento & desarrollo , Etanol , Flores/química , Espectroscopía de Resonancia Magnética , Pinus , Raíces de Plantas/parasitología , Plantones/crecimiento & desarrolloRESUMEN
The ranging instrument aboard the Hayabusa spacecraft measured the surface topography of asteroid 25143 Itokawa and its mass. A typical rough area is similar in roughness to debris located on the interior wall of a large crater on asteroid 433 Eros, which suggests a surface structure on Itokawa similar to crater ejecta on Eros. The mass of Itokawa was estimated as (3.58 +/- 0.18) x 10(10) kilograms, implying a bulk density of (1.95 +/- 0.14) grams per cubic centimeter for a volume of (1.84 +/- 0.09) x 10(7) cubic meters and a bulk porosity of approximately 40%, which is similar to that of angular sands, when assuming an LL (low iron chondritic) meteorite composition. Combined with surface observations, these data indicate that Itokawa is the first subkilometer-sized small asteroid showing a rubble-pile body rather than a solid monolithic asteroid.
