| [correlation between the atmospheric level of antigen amb-al (age) and the number of ambrosia artemisiaefolia pollen grains in lyon and neighboring regions]. | accurate quantitation of the atmospheric levels of pollens and other allergenic particulate is laborious and may not always correlate with the concentration of allergen within the particulate. this study examined the atmospheric contamination by short ragweed (ambrosia artemisiae folia) over 7 weekly periods during ragweed pollination in 6 localities of france centered around lyon. the correlation between data obtained from the conventional microscopic numeration of pollen grain and and the quan ... | 1987 | 3454178 |
| [ragweed (ambrosia artemisiifolia l.): expansion history of a "biological pollutant" in france]. | in france, common ragweed (ambrosia artemisiifolia l.) is an invasive species, which most probably originates from north america. this plant is responsible for human health problems as the pollen causes allergic rhinitis and seasonal asthma; in addition, it engenders agronomical problems as the efficient herbicide treatments are few. consequently, various departments of the rhône-alpes region set up eradication programs for common ragweed. the species is distributed over a large range of ecologi ... | 2005 | 15691495 |
| high genetic diversity in french invasive populations of common ragweed, ambrosia artemisiifolia, as a result of multiple sources of introduction. | ambrosia artemisiifolia is an aggressive north american annual weed, found particularly in sunflower and corn fields. besides its economic impact on crop yield, it represents a major health problem because of its strongly allergenic pollen. ragweed was imported inadvertently to europe in the 18th century and has become invasive in several countries, notably in the rhône valley of france. it has recently expanded in both the provence-alpes-côte-d'azur and bourgogne regions. as first steps towards ... | 2005 | 16313592 |