“Temporal flower closure is a non-morphological floral character of adaptive significance for growth of some species in extreme environments, and it has important implications for plant reproductive success. Flowers of Tulipa species responded
to changes in temperature and closed temporarily at low temperatures, but they reopened when temperatures increased. In this study, we determined the effects of temporal flower closure of Tulipa iliensis Regel. on mating pattern, flower microenvironmental temperature, and sexual organ functions during exposure to low temperatures, rainfall, and wind. First, flowers of T. iliensis were incompletely herkogamous with stamens longer than the pistil. Floral closure resulted in the contact of dehisced anthers with the stigma and auto-pollen deposition on the stigma, thus facilitating automatic self-pollination. Second, floral closure maintained the GSK923295 research buy temperature inside the flower, providing a stable microenvironment that promoted pollen germination and avoided a decline in stigma receptivity. Third, flower closure of T. iliensis
before rainstorms avoided flushing of pollen from anthers and helped maintain both pollen viability and stigma receptivity during exposure to rain. Finally, flower closure maintained pollen clumping in the anthers during exposure to wind, thereby enhancing pollination efficiency by pollinators and/or automatic selfing. Therefore, temporal flower closure of T. iliensis is an important floral strategy in facilitating selleck chemicals automatic selfing, extending the functional period of male and female organs, and it thus ensures reproductive success in the unpredictable early spring environment.”
“Background:\n\nSeveral Alisertib studies have been performed to evaluate the clinical outcome of implants inserted into maxillae grafted with autogenous bone but few reports have focused on maxillae grafted with fresh-frozen allogenous bone (FFAB).\n\nPurpose:\n\nThe purpose of this study is to retrospectively evaluate the clinical outcome of implants installed in resorbed maxillae augmented with FFAB.\n\nMaterials and Methods:\n\nA
total of 69 patients whom had been treated with FFAB grafts to their maxillae and implant placement 4 to 6 months later were retrospectively evaluated. Edentulism was total and partial in 22 and 47 cases, respectively. A total of 287 implants of various systems had been used. A life table analysis was performed. Marginal bone loss was calculated in radiographs.\n\nResults:\n\nFive of the 287 implants were lost, giving a survival rate (SVR) of 98.3% over a mean follow-up time of 26 months. The marginal bone resorption at the implants was 1.68 mm (SD = 0.44) after 1 year and 1.85 mm (SD = 0.98) after 4 years. The cumulative success rate based on defined criteria was 96% in the first year but decreased to 40% at 4 years because of marginal bone loss.