Winogradsky column lab page!

Welcome to the Winogradsky column lab page! Students from the Departments of Biological Applications and Technology, University of Ioannina and Icthyology and Aquatic Environment, University of Thessaly, Greece and the Microbiology course, Faculty of Sciences, University of Cádiz, Spain, discuss their findings on Winogradsky columns they constructed!

If you want to add a post, please feel free to contact the blog administrators (Hera Karayanni, Sokratis Papaspyrou or Kostas Kormas)!

Καλωσορίσατε στη σελίδα των Winobloggers! Διαδικτυακός τόπος συνάντησης φοιτητών, φοιτητριών και διδασκόντων δύο Τμημάτων από την Ελλάδα: Tμήμα Βιολογικών Εφαρμογών και Τεχνολογιών, Παν/μιο Ιωαννίνων και Τμήμα Γεωπονίας, Ιχθυολογίας και Υδάτινου Περιβάλλοντος, Παν/μιο Θεσσαλίας και ενός από την Ισπανία: Σχολή Θετικών Επιστημών, Πανεπιστήμιο του Cadiz. Παρακολουθούμε, σχολιάζουμε, ρωτάμε, απαντάμε σχετικά με τα πειράματά μας, τις στήλες Winogradsky!

Bienvenidos a la pagina web de los Winobloggers! Aquí los estudiantes y profesores de dos departamentos griegos, el Departamento de Aplicaciones y Tecnologías Biológicas de la Universidad de Ioannina y el Departmento de Agricultura, Ictiología y Sistemas Acuáticos de la Universidad de Thessalia, junto con los estudiantes de Microbiología de la Facultad de Ciencias en la Universidad de Cádiz, se reúnen para observar, comentar, preguntar y responder a preguntas relacionadas con nuestro experimento, la columna Winogradsky.

Winogradksy columns

Winogradksy columns
'In the field of observation, chance only favors the prepared mind' Pasteur 1854

Blog posts

Wednesday, 18 March 2015


    This week our Winograndsky column has suffered important changes. 
    The first change we notice is that it has appeared a lot of orange bacterias. It's important to say that these bacterias are more numerous in the side of the bottle where the sun warms up. There is a very small quantity of them in the dark part. They might be photosynthethic bacterias because they have appeared when the sun has started to warm them up and the other reason is that there isn't very much of  them in the dark side of the bottle (where the sun doesn't warms them up). 
Then, the black spots have gathered on some specific parts of the botlle, and they aren't dispersed now. We aren't very sure about what can it be, but we think they're sulfur-reducing bacterias because of their dark colour, but it is strange because they use to appear on the depths. We can see that the black is turning to a very dark purple colour.

Finally, it has appeared a sediment surface that could be photosynthesis results (organic matter), dirt that is floating or maybe some aerobic bacterias which use the oxygen for the cellular respiration and their color is black too.

You can see the results on the next images:

Dark side of the bottle. Light side of the bottle.


  1. Questions questions questions...

    You say that where the black spots are, there are sulphate reducing bacteria. Are sulphate reducing bacteria black?

    Are there sulphate reducing bacteria now only where the black spots are?

    Something to sleep on...


    1. No, sulphate reducing bacterias are purple. Now, we know what black spots are. Black spots are sulphate reducing bacterias precipitate, which shows those bacterias' presence.

  2. !!!!! Really nice! Any idea why the sediment is yellow?

    1. Orange or yellow areas are a result of nonsulfur bacterias, which need a carbon source to thrive. The carbon these bacterias use is obtained from the paper we added to the bottle.