| aerobiological studies based in derby. ii. simultaneous pollen and spore sampling at eight sites within a 60 km radius. | in order to determine whether a sampling site in the centre of derby, where air sampling had been carried out for five summers, really provided valid aerobiological data for the surrounding area, eight identical volumetric spore traps were operated simultaneously during the summer of 1969 at various sites up to 56 km from derby. for most pollen and spore types, total numbers and seasonal pattern at all the sampling sites were found to be similar, although a few extreme and unexpected variations ... | 1978 | 568523 |
| aerobiological studies based in derby. iii. a comparison of simultaneous pollen and spore counts from the east coast, midlands and west coast of england and wales. | the air spora of two sites on the east coast of britain and one on the west coast were compared with each other and with the regular sampling site in derby by the simultaneous operation of volumetric spore traps. concentrations of airborne spores and pollen were found to be usually less at the coastal sites than in derby. the effect of wind direction was shown to be important at coastal sites because daily counts often showed rises and falls corresponding to off- and on-shore winds respectively. ... | 1978 | 709803 |
| aerobiological studies based in derby. i. a simplified automatic volumetric spore trap. | a simplified version of the hirst automatic volumetric spore trap has been developed in derby for aerobiological studies. in comparative trials, the number of spores retained by the morrow brown trap were similar in the case of larger spores such as alternaria (102%), rather higher in the case of grass pollen (136%) and considerably higher (166--201%) for very small spores such as sporobolomyces and tilletiopsis. impaction efficiency has been improved by using a narrower slit. the trap designed ... | 1978 | 709802 |