Particulate matter (PM) and pollen interaction, either airborne or at the respiratory mucosa needs further clarification, as allergic reaction intensification can be related to the PM physical characteristics and toxicity. This study aimed to investigate the physical-chemical properties of PM that can adhere to the pollen wall during its transport or inhalation, using Quercus spp. as a model, in three Portugues...
Air pollutants impact airborne pollen biochemistry. Oxidative damage to lipids, proteins and nucleic acids or protein nitration are among ozone (O3) and nitrogen dioxide (NO2) described deleterious effects possibly causing pollen physiology damage and enhanced allergenic activity, contributing to aggravate pollen driven respiratory allergy in urban areas. The goal of this research was to evaluate the effects of...
Background : Airborne pollen during its transport become in contact with a variety of atmospheric chemicals, including the common air pollutants O 3 and NO 2 . Nevertheless, the effect of these pollutants, alone or in combination, is not fully elucidated. With a strong oxidiz-ing potential, ozone may affect pollen redox balance and contribute to change the ratio of ROS scavenging enzymes and in the presence of ...
O presente trabalho tem o objetivo de avaliar os efeitos do pólen do milho transgênico, que expressa a proteína entomopatogênica Cry1Ab, sobre aspectos biológicos da traça da cera (Galleria mellonella) e com isso propor uma discussão sobre as possibilidades de afecção desse piralídeo à campo, debatendo possíveis efeitos ecológicos. Um ensaio biológico foi realizado, onde se ofertou às larvas pólen do milho tran...
Recent worldwide increase in pollinoses has been attributed to the synergy between pollen and pollutants. We used EPMA for the elemental characterization of the airborne pollen surface in order to find out what occurs to the wall of pollen grains when they are together with other atmospheric pollutants. Analyses were performed both to airborne pollen and to pollen that was collected from Acer spp., Platanus spp...
Os dados para a calibração e validação dos modelos resultam dum projeto FCT que se encontra no terceiro ano. Abrange quatro cultivares (Arbequina, Cobrançosa, Galega, Picual), quatro localizações principais (Mirandela, Santarém, Elvas e Moncarapacho). Os dados das temperaturas horárias foram obtidos a partir de estações meteorológicas localizadas na vizinhança dos ensaios. Os dados do vingamento foram obtidos a...
In the last years, a rising trend of pollen allergies in urban areas has been attributed to atmospheric pollution. In this work, we investigated the effects of SO2 and NO2 on the protein content, allergenicity, and germination rate of Acer negundo pollen. A novel environmental chamber was assembled to exposure pollen samples with SO2 or NO2 at two different levels: just below and two times the atmospheric hour-...
A agricultura é afectada pelas alterações climáticas, que se farão sentir, principalmente, nas seguintes vertentes: datas de ocorrência dos eventos fenológicos, crescimento e produção, uso da água e necessidades hídricas, competição de infestantes e eficiência de herbicidas, taxa de erosão do solo, incidência de pragas e doenças e eficiência de pesticidas, condições económicas, financeiras e sociais dos agricul...