Giuseppe Frenguelli

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This report describes qualitatively and quantitatively the content of pollen in the atmosphere of central Italy during the five years 1982–1986. Total production in this period showed fluctuations depending on the flowering seasons of the anemophilous taxa. The season of maximum pollen concentration was from April to July, with a prevalence of arboreal(More)
  • G Frenguelli
  • Monaldi archives for chest disease = Archivio…
  • 2002
Records of the start of some allergenic pollen seasons monitored in Perugia (Central Italy) for the last two decades indicate a trend for the pollen seasons of spring flowering plants to begin earlier. The duration of the pollination of some taxa shows a trend to be shorter while Urticaceae reveal an increase of 20 days for its length over the same period.(More)
In order to survive periods of adverse cold climatic conditions, plant requirements are satisfied by means of physiological adaptations to prevent cells from freezing. Thus, the growth of woody plants in temperate regions slows down and they enter into a physiological state called dormancy. In order to identify the chilling and heat requirements to overcome(More)
Air pollution is frequently proposed as a cause of the increased incidence of allergy in industrialised countries. We investigated the impact of ozone (O(3)) on reactive oxygen species (ROS) and allergen content of ragweed pollen (Ambrosia artemisiifolia). Pollen was exposed to acute O(3) fumigation, with analysis of pollen viability, ROS and nitric oxide(More)
The effects of canopy leaf position, light availability and the presence of fruit on leaf net photosynthesis rate (Pn) were evaluated in a chestnut orchard located in Central Italy. The study was carried out on Castanea sativa Mill. cv. `Marrone di Stroncone', native to the Umbria Region, and on an interspeci®c hybrid Castanea crenata Castanea sativa, cv.(More)
BACKGROUND Grass pollen is a worldwide cause of respiratory allergy. Identifying the causative species is essential, for example for choosing the appropriate immunotherapy, because not all grass allergens are totally cross-reacting, and the pollen calendars provide only a gross estimate. Phenologic analyses allow identification of the pollen release for(More)
Epidemiological studies on the pollens responsible for allergic diseases throughout Italy are lacking. Routine diagnostic panels consist prevalently of grass, Parietaria, weeds, birch, olive and mugwort. Considering the great variety of Italian geographical areas and the observation of the growing allergological importance of new botanical species (e.g.,(More)
BACKGROUND Respiratory allergy to the pollen of Cupressaceae is becoming more and more common every year in the Mediterranean area. OBJECTIVE The purpose of this study was to see whether the allergenic potency of Cupressus arizonica pollen diminished after a 6-year period (1994-2000). MATERIALS AND METHODS Among the Cupressaceae, we selected the pollen(More)
Roles for nitric oxide (NO) and reactive oxygen species (ROS) during pollen-tube growth have been well established in angiosperms, but there remains lack of information regarding their potential signalling roles in pollen tubes in gymnosperms. Here, the pollen-tube elongation of Arizona cypress (Cupressus arizonica Greene) was investigated. Nitric oxide,(More)