Aleksandra Andrzejowska- Master of Science
- PhD Student at Jagiellonian University
Aleksandra Andrzejowska
- Master of Science
- PhD Student at Jagiellonian University
About
9
Publications
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Introduction
In my research I delve into organisms, which are among the most resistant to environmental stresses – Antarctic lichens. My main research method is solid state 1H-NMR (Nuclear Magnetic Resonance).
I am gravitating towards developing the theory explaining resistance to both cold and desiccation. In addition to NMR technic, I am using Differential Scanning Calorimetry (DSC) to characterize phase transitions and Chlorophyll Fluorescence (ChlF) to determine photosyntetic processes in lichens.
Skills and Expertise
Current institution
Publications
Publications (9)
Chlorophyll fluorescence techniques represent an effective tool for photosynthetic performance of extremophilic poikilohydric autotrophs from cold Earth regions. Many parameteres of these techniques can detect the response of photosystem II (PS II) to a great variety of stressors. Chlorophyll fluorescence parametrs related to PS II funcioning are u...
The poster describes the method of constant rate-cooling combined with the measurements of chlorophyll fluorescence parameters assessing functionality of photosynthetic photosystem II. The tho methods may distinguish species-specific differences in Antarctic lichens, their cryoresistance in particular.
This study explores and compares the limits for photosynthesis in subzero temperatures of six Antarctic lichens: Sphaerophorus globosus, Caloplaca regalis, Umbilicaria antarctica, Pseudephebe minuscula, Parmelia saxatilis and Lecania brialmontii combining linear cooling and chlorophyll fluorescence methods. The results revealed triphasic S-curves i...
Amorphous bosentan alone lacks dissolution flux that could enhance its bioavailability. Its coamorphization with hydrophilic copovidone (1:1) enables to improve wettability and dissolution rate, but fine amorphous particles are prone to moisture uptake. Water sorbed on the surface of this amorphous solid dispersion can considerably alter its physic...
Adaptations of organisms to different environments may be important in view of different stressors caused by climate change. Antarctic lichens provide a good model for studying resistance to environmental extremes. Our goal was to compare changes in water storage of Caloplaca regalis from two different localities in Antarctica. King George Island (...
Gaseous phase hydration properties for thalli of Niebla tigrina from Atacama Desert, and for Umbilicaria antarctica from Isla Robert, maritime Antarctica, were analyzed using ¹ H-NMR relaxometry, spectroscopy, and sorption isotherm analysis. The molecular dynamics of residual water was monitored to distinguish the sequential binding very tightly, t...
