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

Sunday, 4 December 2016

                        DIMITRA-IOLI SKOUROLIAKOU
WEEK: 6th
LEFT: control
RIGHT: warmth-exposed

The differences between the two columns are more obvious from the 5th to the 6th week.

In the first column, growth of urple sulfur bacteria in the middle zone is more odvious.

Purple sulfur bacteria are group of proteobacteria capable of photosynthesis and they are illuminated in anoxic zones. Unlike cyanobacteria or plants they do not use water as ther reducing agent, so they do not produce oxygen. Instead, they use hydrogen sulfide from the botom of the bottle which oxidised ti produse granule of elemental sulfure

In both columns, is still observed the presence of biofilms, the concentration of which, is greater in the first column

After 6 weeks, it has started a gradual distinction in the zones of the column, starting with the disply of sulphates purple bacteria. Considering that the forementioned zoning hasn't been yet observed in the 2nd column we can safely assume that it's groth rate is considerably slower. This happens probably due to the rapid fluctuation of temperature that affects the bacteria, not only directly by limiting the growth of the non-resistant, at high temperatures, bacteria, but also it affects them indirectly by the overheating of the plastic bottle that excretes damaging chamicals.

Hypothesis: The rapid fluctuation of the temperature on daily basis, reduces the growth rate of the microorganisms in the 2nd Winogradsky column

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