| effect of five flavonoid compounds isolated from quercus dentata thunb on superoxide generation in human neutrophils and phosphorylation of neutrophil proteins. | effect of five yellow compounds isolated from quercus dentata on superoxide generation and protein phosphorylation in human neutrophils was investigated. the five yellow compounds examined were kaempferol 3-o-beta-d-glucopyranoside (b), quercetin 3-o-beta-d-glucopyranoside (da), kaempferol 3-o-(6"-trans-p-coumaroyl)-beta-d-glucopyranoside (d1), kaempferol 3-o-(2"-6"-di-trans-p-coumaroyl)-beta-d-glucopyranoside (d7) and kaempferol 3-o-(2",4"-di-acetyl-3"-cis-p-coumaroyl-6"-trans-p-coumaroyl)-beta ... | 2001 | 11282099 |
| seasonal changes in the genetic structure of an aphid-ant mutualism as revealed using microsatellite analysis of the aphid tuberculatus quercicola and the ant formica yessensis. | the present study examined whether the mutualistic relationship between the aphid tuberculatus quercicola (matsumura) (homoptera: aphididae) and the attending ant formica yessensis forel (hymenoptera: formicidae) has had any mutual effects on the microgeographical genetic population structure of both partner species. the aphids and the attending ants were collected in june, august, and october 2004 from six trees of the daimyo oak quercus dentata thunberg (fagales: fagaceae) and were genotyped u ... | 2009 | 19619024 |
| contrasting patterns of genetic structure and dispersal ability in ant-attended and non-attended tuberculatus aphids. | aphid species within the genus tuberculatus exhibit a variety of interactions with ants, ranging from close associations to non-attendance. an ant-attended species, tuberculatus quercicola, and two non-attended species, tuberculatus japonicus and tuberculatus paiki, are sympatric and hosted by the tree species quercus dentata (fagaceae). an undescribed ant-attended species of tuberculatus (sp. a) and several non-attended tuberculatus species are found on quercus crispula trees. the population ge ... | 2010 | 19923136 |
| studies on the causes of forest decline in nanshan, chongqing. | nanshan is located in the south suburb of chongqing, sichuan province in china. it is about 10 km from the city of chongqing. there are about 2000 ha of forest, mainly masson pines (pinus massoniana lamb) which have exhibited decline since the beginning of the 1980s. surveys of stands estimated that 85% of masson pines are injured. symptomology of masson pines includes tip necrosis of needles, thin crown, reduced needle length, premature abscission, branch dieback, reduced radial growth. the fol ... | 1990 | 24243326 |