ULTRASTRUCTURE OF PLANT CELLS AND CELLULAR STRESS

 

 

Physiological stress responses in plant and animal cells are well known and molecular players that are involved in stress defense, avoidance or tolerance have been subject to numerous investigations. However, there is a tremendous lack in information on how stress responses are sub-structurally transposed and whether there are common structural hallmarks of programmed cell death (PCD) and autophagy among plant and animal cells at different evolutionary level. Central questions in this respect are origin and structural transformation of autophagosomal membranes, structural realization of specific organelle degradation by selective autophagy and ionic regulation of these events. We are studying these processes in the unicellular model alga Micrasterias denticulata (Streptophyta) which is phylogentically closely related to higher land plants. Comparative studies on structural cellular stress reactions are also done in several cooperations on mammalian cells.

Due to its extraordinary cell shape which allows precise definition of each cell stage and its high sensitivity to any environmental impact, the unicellular alga Micrasterias has proved to be a well suited model system for studying structural and physiological stress responses. Results on impact of heavy metals, high salinity, herbicides and oxidative stress have been published in the recent years and the studies are still ongoing. Moreover, we are interested in starvation induced autophagy and lipid degradation. Our methodological spectrum comprises mostly advanced techniques in transmission electron microcopy (TEM) such as immuno TEM, electron tomography after cryo-preparation as well as analytical TEM like electron energy loss spectroscopy and electron spectroscopic imaging. The latter methods allow identification and localization of single elements or compounds in situ and also give insight into chemical bonding which is particularly advantageous for tracing distribution of environmental pollutants or heavy metals intracellularly. Additionally we are employing standard cell biological techniques like light microscopy, confocal laser scanning microscopy, protein biochemistry, enzyme activity assays, measurements of photosynthetic activity and respiration as well as molecular biological methods.

  • News
    What challenges has the corona pandemic brought to journalism? Can the media transform the increased interest in what they offer into sustainable (digital) business models?
    Are you looking for an exciting and educational master's degree? Then the Centre Jewish Cultural History is the place for you! We are looking forward to presenting our master's degree course online on Monday the 8th June 2020 at 17:00.
    „UNInteressant? – "Ideas that will improve our lives": With this slogan Universities Austria (uniko) is launching an online-campaign, in which all of the 22 public universities will cooperate with the Austrian Science Fund the FWF.
    17:00 FRANK MAX MÜLLER (Salzburg/Gießen): The collective is dead, long live the collective! 1968 and the ongoing search for models of cooperation in the arts // REGISTRATION for the online lectures by E-Mail to: Anna.Estermann@sbg.ac.at // https://w-k.sbg.ac.at/figurationen-des-uebergangs
    01.09.-12.09.2020, https://ditact.ac.at. Due to the current pandemic situation the ditact_womens IT summer studies of the University of Salzburg will take place a week later than planned, from the 01.09.-12.09.2020. Most of the courses will be held online.
    The Vice Rectorate for Research, Nicola Hüsing, received five thousand face masks, which were donated by Gebrüder Woerle Ges.m.b.H. in keeping with the motto „SHARING is CARING“ . The face masks were given out to the employees of the University of Salzburg.
    Due to the current situation personal contact with the Psychological Counseling Center is not possible at the moment. We are however available by e-mail, telephone, chat or video chat. Unfortunately, our normal range of workshops cannot take place in the usual way. We would however like to offer the following webinars as an alternative.
    We are gradually learning how to adapt to the Corona outbreak, both in our everyday lives as well as at the university. For us, this means changing to online teaching for the duration of the current semester. Courses and exams held in lecture halls and seminar rooms will not be possible, with exception to some special exams. Regulations for this are currently being drawn up; exceptions are also to be made for selected laboratory exercises and practical sports courses.
    Information of 23rd April 2020: The Minister of Science’s new ruling on special regulations for study law at universities has now been announced, which gives us the opportunity to regulate some important matters. Please note that these regulations have been set for a limited time period (i.e. for this semester, but sometimes even beyond this).
    Current information on labour law at PLUS
    The most important information on the changes to research services at the University of Salzburg.
    Distance learning for exchange students and the completion of courses from overseas.
  • Veranstaltungen
  • 04.06.20 acid communism
    04.06.20 Let’s play Infokrieg. Wie die radikale Rechte (ihre) Politik gamifiziert
  • Alumni Club
  • PRESS
  • Uni-Shop
  • University of Salzburg's facebook site University of Salzburg's twitter site University of Salzburg's instagram site University of Salzburg's flickr site University of Salzburg's vimeo site