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

Friday, 17 June 2016

UCA_5A_: Day 16/6/2016

Winogradsky’s column

Rio San Pedro Sand+ Napkins+ Ca2SO4

After weeks of preparation Winogradsky’s column we observed significant changes in the appearance of the column, as we can see in the pictures. These changes are different from the column was exposed to sunlight respect to which was in almost total darkness.

- Column exposed to the sun: In the face of the column that is exposed to direct sunlight we see very little change . The few changes that are occurring at the bottom of the column, where we see an intense black color. This black color is given by the production of hydrogen sulfide (H2S) bacteria that use sulfur as an energy source.

In the face that is not directly exposed to sunlight we appreciate more changes : The zone is much rich black color ; It can be seen pink small areas , due to some purple sulfur bacteria .

 In the edge of both faces and between the black zones with the Brown zones (earth)
orange stripes are appreciated caused by iron oxide

- Column in the darkness: In this column we see that the black color is much more
spread throughout the column the column , and there aren’t any differentiations between two sides , since none has been exposed to the sun.

The orange coloration only appears, in this case in the surface of the column.

The black color is produced, as mentioned before, for the production of hydrogen sulfide , predominating in the base of the column , but extends along the rest due to the movement of substrate , water or the cells themselves

- Given these observations we can deduce that the action of light affects the development of microorganisms , favoring those who are photosynthetic , and disadvantaging Sulfur bacteria and other organisms that develop in the bottom of the column.

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