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, 4 April 2016

UCA_3B E _2: Two weeks later..

As a continuation...
Two weeks later changes have not been significant to the column without light: we 
can see a homogeneous dark gray colour in all of the column except for the top, where the colour is brownish with a fine red line.


Maybe that's because the top of the bottle contains a lot of population of different types of bacterium, all of them are aerobic and live in aquatic habitats rich in organic matter. However, it is also certain that the amounts of H2S from the mud oxidized to SO4 by bacterias (geneus Beggiatoa) that oxidize S to produce energy, that's is the red line (look the point of the pen).
Black colour is produced by sulfur-reducing bacterium, these bacterium degrade cellulose of paper to glucose and fermented the glucose to produce simple organic compounds, used for anaerobic respiration, spend sulphate and generate large amounts of hydrogen sulphide. Hydrogen sulphide reacts with any ferric compound present in the sediment, producing iron (II) sulphide, which produces the colour black. Also, methange generating bacterium appear and produces gas bubbles in the Winodgrasky colum.
See you soon!!   
Inmaculada Lopez, Hanael Maciá y Angel Soto.

1 comment:

  1. Beggiatoa and other sulfide oxidising bacteria are typically white in colour (due to the accumulation of elemental sulfur granules intracellularly), not red. Some other bacteria are responsible for the red colour. Which?