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

Monday, 18 April 2016

UCA_6B_2: Day 14 - The Return of The Column

Rio San Pedro sediment + 1g CaSO4

Our column has return from the dark side (the box) and we can see some changes. The whole column has little dark stains between the sediment and we could recognize them as reduced Iron.

The bottle with the FeS (black stains)
This is a result of two situations: the first one is the change of the pH (which is more acid) and the other and more important one is that some microorganisms obtains energy oxidizing the Iron like, for example the Thiobacillus ferroxidans, so the dark stains we can see are the FeS created by the microorganisms that reduce the Iron.

The water is dimer due to the increase of the organic matter (due to the eutrophication). Compared to the others columns ours is darker because of the high proliferation of the microorganisms, who will reduce the Iron. The high proliferation is helped by the CaSO4 which is use by the chemosyntethic microorganisms as nutrients in the trophic chain.

We add some photos to see what we describe in the post: 

The top of the column.

1 comment:

  1. Comparison with the light column?

    One more question. Why is the medium becoming more acidic?

    Check what Thiobacillus ferooxidans does and where it lives.
    Check whether sulfate reduction produces and acidic enviroment.
    What is your conclusion (report it back to us please).

    If someone is up to it, next time I go to Huelva sampling in the AMD affected reservoirs, he/she is welcome to come along.