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

Tuesday, 12 April 2016

UCA_3B-7B_2: Day 14 - Let there be life.

Rio San Pedro sediment + 0.20 g CaSO4 + filter paper

Let's have a look at the column that has been exposed to light.

We can perfectly tell apart the side of the bottle that has been exposed to sunlight from the one that has not.

In the lower region, a blackish colour can be seen due to the precipitation of iron sulphide (product of iron oxidation in the presence of hydrogen sulphide coming from the CaSO4.

Halfway up, in the area exposed to light, aerobic microorganisms have not had enough time to fully develop. However, at the top are what appear to be small green algae. They grow in this area because they have sunlight and oxygen at their disposal. But, they are not yet prepared to grow in intermediate zone due to hydrogen sulphide.

Meanwhile, the column that has not been exposed to light at all...

The Rio San Pedro sediment lies now at the bottom of the column and in the superior part of the column, there is approximately two inches of water. The bottom has a darker colour than the rest of the bottle. This is due to the presence of iron sulphide that comes from the activity of anoxygenic bacteria. The middle part of the column has a grey color with black dots.

On the part at the top of the column (let's remind that this part is just water) we can distinguish traces of iron oxyde, which possess a copper-bright orange colour. The reason that this compound appears is that some oxygen can penetrate through the bottle's plastic.

Stay tuned for more on our columns!

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