Publications by authors named "Hana Vrablikova"
Background: Preterm birth is a leading cause of perinatal mortality and morbidity. Heavy cervicovaginal Ureaplasma colonization is thought to play a role in the pathogenesis of preterm birth. The administration of vaginal progesterone has been shown to reduce the incidence of preterm birth in women with short cervical length.
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- This study investigates how curling in the old forest lichen Lobaria pulmonaria helps protect it from damage caused by bright light.
- Natural curled thalli experienced less photoinhibition during light exposure compared to artificially flattened specimens, suggesting that curling plays a significant role in photoprotection.
- Areas shaded by curled lobes maintained stable chlorophyll fluorescence, indicating they suffered less damage, while flattened thalli showed notable photoinhibitory effects under intense light conditions.
Article Synopsis
- The study investigated seasonal changes in photosystem II efficiency and photoprotection mechanisms in the lichen Xanthoria parietina over a year in southern Norway.
- Key findings included minimum levels of photosynthetic efficiency and chlorophyll in spring, with maximum levels occurring in late autumn, while xanthophyll pigments and non-photochemical quenching peaked in spring and decreased by winter.
- The results suggest that both the photobiont and mycobiont play a crucial role in acclimating to seasonal solar radiation variations, emphasizing the importance of fungal regulation in photoprotection strategies.
Hydrated thalli of two lichen species--Umbilicaria antarctica and Lasallia pustulata--were exposed to high light (1800 micromol m-2s-1) for 30 min. High light exposure led to a decrease of total glutathione in both species, while de-epoxidation state of xanthophyll cycle pigments and non-photochemical quenching increased. In the subsequent recovery, the values of de-epoxidation state of xanthophyll cycle pigments decreased towards initial values.
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