One of the most frequent questions a Palaeobotanist or Palaeontologist hears concerns the method for dating sediments containing fossil plants and animals. Present knowledge is based on a long series of efforts to date the ages of various rocks. At the present time, the best absolute dating involves the use of naturally occurring radioactive isotopes contained in various minerals that [...]
The term aerobiology came into use during 1930 for the studies of airspora like airborne fungal spores, pollen grains and other microorganisms. Jacobs (1951) elaborated the term to include dispersion of insect populations, fungal spores, pollen grains, bacteria and viruses. In fact, all forms of life belonging to both plants and animals which become airborne are transported partly or wholly [...]
At present several cross-reactive groups of pollen allergens have been identified: 1. The PR 10 Family 2. Profilins 3. Pollen Calcium-binding Proteins or Polcalins 4. Oleaceae Pollen Group 1 Allergen 5. Thaumatin-like Protein or the PR-5 Group 6. Grass Pollen 1 Allergen or the β-Expansins 7. Group 1 Allergen of the Ragweed Pollen 8. PR-12 Group 1 allergens of the [...]