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Two new localities of orchids: Listera ovata and Dactylorhiza incarnata were found during the floristic investigations carried out in 1996 on the area of ecological uselands “Kopanina I” and “Kopanina II”, situated in the south-west part of Poznań. In the years 1997-1999 the changes of acreage and of population structure of both taxa were observed. Orchids grow in the conditions of strong anthropopressure, on the habitats of clearly secondary nature. However, the significant changes in the number and in the form of individuals were not noted.
The influence of fluoride on tooth germ development, especially mineralised tissue, is well documented in numerous dental publications, but there are few reports concerning the influence of fluoride on enamel organ and dental papilla cells. The aim of the study was to assess histologically the development of tooth germs of 20-day-old rat foetuses whose mothers drank water without fluoride or with low (10 mg) and high (110 mg) contents of natrium fluoride, starting from the 12th day of the pregnancy. The fluoride contained in drinking water in low as well as high concentration accelerated the development of enamel organ and dental papilla structures in rat foetuses. The acceleration was proportional to the content of fluoride in drinking water. No disturbances caused by high concentration of natrium fluoride were observed.
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