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, 12 December 2016

                        DIMITRA-IOLI SKOUROLIAKOU
WEEK: 7th
LEFT: warmth-exposed
RIGHT: control

   Warmth – exposed column                                          Control column


  Between the 6th and 7th week, we couldn’t descry any obvious difference.
  The growth of the purple sulfur bacteria in the middle zone is still more visible in the control column than in the warmth-exposed column. During photosynthesis, unlike cyanobacteria or plants, they bind sulfur from the bottom of the column producing hydrogen sulfide, rather than oxygen. Thus, the purple sulfur bacteria cause anoxic conditions in the middle zone they grow.
  In both columns, is still observed the presence of biofilms, the concentration of which, is greater in the first column.
  This gradual distinction in the zones of the column, starting with the display of sulphates purple bacteria, has only been observed in the control column, even after 7 weeks. Thus, it can be assumed that the growth rate of the bacteria in the 2nd column, is considerably slower, as zoning hasn’t been observed yet. This fact is probably due to the rapid fluctuation of temperature. In the warmth-exposed column, this affects the bacteria directly by limiting the growth of the non-resistant ones at high temperatures. Also, the bacteria in this column, in order to get protected from the temperature fluctuation, could form spores, which means a static metabolic condition. Rather than that, the overheating of the plastic bottle can excrete damaging chemicals for the bacteria.

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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