| existence of exine-free airborne allergen particles of japanese cedar (cryptomeria japonica) pollen. | we investigated whether exine-free pollen allergen particles exist together with the intact pollen grains of japanese cedar (cryptomeria japonica) in the air during the pollen season in yamagata city. first, we separated the allergen particles in an andersen multi-stage air-sampler according to their aerodynamic diameters. the amount of major allergen (cry j i) on each stage of the sampler was determined by a sensitive fluorometric sandwich elisa, and the pollen count of the same samples was don ... | 1991 | 1789400 |
| [hourly variations in the dispersion of japanese cedar (cryptomeria japonica) pollens in the yamagata basin and the effect of cold and warm fronts on the pollen counts]. | airborne pollen counts of cryptomeria japonica (cj) were investigated at three points in the yamagata basin: 1. the central part of yamagata city (point a), 2. at the foot of a mountain with a cj grove (point b), 3. within the cj grove (point c). at the beginning of the cj pollen season, the airborne pollen counts at point b showed higher values than those at point a, whereas the relation of the count values was reversed later at the major pollen dispersion period. numerous airborne pollens were ... | 1989 | 2589976 |
| [effects of global climate change on japanese cedar pollen concentration in air--estimated results obtained from yamagata city and its surrounding area]. | the effects of global warming on japanese cedar pollen concentration in air were examined. there was a significant increase in total pollen count in years where small or average values of pollen dispersion were observed and where summertime temperatures were postulated to have risen from 2 to 5 degrees c. there were no remarkable differences in total pollen count in years where large values of pollen dispersion were observed. on the other hand, a drastic decrease in total pollen count was expect ... | 1996 | 9133338 |
| tree-ring strontium-90 and cesium-137 as potential indicators of radioactive pollution. | to examine whether tree rings can be used to detect or assess local historical 90sr or 137cs fallout, such as that resulting from the hiroshima atomic bomb, radial distribution of 90sr and 137cs in trees was examined. we studied a gymnosperm [japanese cedar, cryptomeria japonica (l. f.) d. don] and an angiosperm (japanese persimmon, diospyros kaki thunb.) tree species from the vicinity of the atomic bomb hypocenter, and from other locations in japan. a significant amount of 137cs was detected in ... | 2002 | 12469850 |