Winogradsky column lab page!


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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

Thursday, 25 May 2017

Winogradsky Column Evolution (Group A)


Winogradsky Column After three weeks (Group A)

The column that has been in contact with sunlight has created two levels inside the column. The upper level has been pushed and raised to the top because of the gases that the microorganisms of the lower level have caused. The upper level has a clearer color and contrasts with the other level. The color is grayish brown, probably due to the death of microorganisms at this level. On the other hand, a layer of gases has been created, as we have already said. This layer with the small amount of water in the upper level causes oxygen to pass to the lower level. For this reason, microorganisms that function without oxygen can not be developed.
We have lowered the upper level and removed the gas layer, we also introduced some water.
We see in the inferior level diverse colors, purple, brown, orange and the characteristic black that has been intensified enormously.


Let's talk about the column that has been kept in the dark. No major changes are seen in the column. The colors have been maintained. The column has been compacted a little by the top, the cracks have disappeared. The same amount of water is maintained at the top and from time to time there are bubbles there are bubbles that rise from the end of the column, gases generated by microorganisms.

Winogradsky Column After one week (Group A)

In the picture we can not see to many differences between both columns.
We think that the black color in both columns are from the combination of iron and sulfur.

On the other hand, we think that they look similar because the column that is in the sunlight doesn’t need it as energy source. 

 

The left picture is the column in darkness and the right picture is the column exposed to the light.

Winogradsky Column First Week (Group A)

Winogradsky column is a mechanism that allows the crop of microorganisms. The objetive is to be able to differenciate some communities of microorganisms. For that, we are going to preparate two columns, one of them will be in the darkness and the other one will be in the sunlight.
Our columns have 20.15 g of mud, some of CaCO3 (this is for enrich living organism autotrophs), CaSO4 (this produces energy), glucose (it is a food and energy source), and agar (this can resists to some microorganisms, that’s why not every microorganisms are going to use it). Finally, we are going to put some salt water, mix it and distribute our mixture into two columns.

Then we are going to add more salt water and we will put one of them in the darkness and the other one in the sunlight. 

Final post: ''Results of a Winogradsky column''. Group A4.

In this post we are going to discuss the evolution of the column in the fifth (the last) week,
The surface is more green compairing with the fourth week, due to the growth of microalgae and cianobacteria (aerobic photosinthetic). Furthermore in this part of the column there are more bubbles because there is more oxygen than the previous week.
In the middle of the column the pink is more intense because the anaerobic photosintetic bacteria have been producing more sulphure. For that reason when we hit the column in the table the smell is worse than the last week.
The part of the column that is reached by the sunlight has a brown colour while the otherside is black, due to the presence of heterotrophic bacteria which oxidate iron, in the brown part.
To sum up, comparing with the prediction in the first post we can conclude thet,
1. Halophilic bacteria haven't appeared apparently.
2.Cianobacteria (autotrophic bacteria) have grown in the surface of our column, as we expected.
3.Heterotrophic microorganisms have appeared too (they oxidate iron).
4.Microorganisms which can assimilate the sulfur have appeared.
        

Tuesday, 23 May 2017

UCA_C2_2 - The process of our column

 A week after developing our Winogradsky column, we can start seeing important and different changes. First of all, fermenting cellulose bacterias have grown (corresponding to the black colour of the background). These bacterias might be the Clostridium genre. We can also see some grey parts due to sulphate reducting bacterias.
In the aerobic area, the top of the column, seaweeds may have grown so that they could produce oxygen after doing photosynthesis with the light the column receive everyday (the column is next to a window). This fact could be an explication to the bubbles we see at the top.
In the middle of the column there is no remarkable change. Here you have some photos to see all these changes and to follow better the evolution of our column.
Irene, Raúl and Nieves




Monday, 22 May 2017



UCA_6B_1: Day 1 -  OUR LITTLE TOWN OF MICROORGANISMS


Hi! We are Sara and Kenia.

We are biotechnology students at Cadiz Science university. We are going to explain how our Winogradsky column develops. Our goal is to create two gradients (one of them is H2S and the another one is of O2) where different microorganisms will grow.

We have added 30,1 g of mud from Rio San Pedro to our column and we have mixed it with 0,1 g of CaSO4. This mix is TO crEate a gradient of SO4.

After that, we have added 0,1 g of NaHCO3 thaT produces CO2 : if the microorganisms are autotroph, they will make their own nutrients from inorganic carbon.
We have also added 0,1 g of cellulose so these microorganisms can feed themselves, because cellulose is a polymer of glucose .
 we have put all of them in a cristal tube.

Finally, we have put our column near the window, so the microorganisms can catch the sunlight and take advantage of it.

We will see the evolution of the column during a few months, so we will show you photos of our winogradsky column along the time.

Sunday, 21 May 2017

                                                         SECOND POST


Hello! It´s been six weeks since we prepared our column and now it´s time to talk about the changes we have seen. Here we have some photos.





As we can see, at the bottom of the column it has appeared a black colour joined with a pink colour. We suppose that in this area there is not oxygen, so we can find microorganisms which are able to make fermentative processes.



The waste of these microorganims is used by bacteria that reduce the sulphate. The result of this process is the liberation of sulphides. It goes to the top of the column which is oxygenated by cyanobacteria and algae.


Also, there are photosynthetic bacteria that use the sulphur we can find in the column due to the sulphide gradient.

                                                                                          Victoria, Andrea, Alessia.

UCA_E7-8_2: 6th week.


WINOGRADSKY COLUMN (6th week)



Rio San Pedro sediment + 0,3 g NaCl + 0,3 K3PO4 + 0,4 g sugar + 0,4 g CaSO4


Several weeks after the Winogradsky column was made, many appreciable changes were observed in each column. 

In this image, you can see the different areas of each column after about six weeks of its completion.

In the column on the left, which was exposed to sunlight, there are four areas where different microorganisms have intervened, whereas in the right column, which was devoid of light, has three distinct areas. These changes are due to the action of different bacteria in each area of the column.


Column exposed to light.

This column is characterized by the presence of light, so the bacteria are photosynthetic.
The lower zone is characterized by being anaerobic and fermenting, but without oxygen. This fermentation transforms the organic matter into sulfur as a gas (H2S normally). This gas decreases as we move through the column to higher areas. In this zone, the bacteria transform the sulfur present in CaSO2 and transform it into H2S. This area usually presents a black color and occupies much of the column.
As we rise in the column, the hydrogen sulphide from the bottom is consumed by anaerobic bacteria that reduces the present sulfur. This area has a black color and also occupies a large area of the column.
The brown area has the presence of sulfur and oxygen. This zone is aerobic because diverse bacteria oxidize the sulfur coming from inferior zones. Sulphates appear in this zone.
At the top of the column is the aerobic zone, where there is a higher concentration of oxygen. For this reason, bacteria that inhabits aquatic environments appear. This area is rich in organic matter and is the smallest area of the column.


Column not exposed to light.

This column presents bacteria that do not use sunlight for their evolution, that is, they are chemosynthetic. In the areas of the column there are many similarities to those mentioned above in the previous column.
The lower zone is also similar, where the organic matter is transformed by the bacteria into sulfur, obtaining a great amount of that element.
Next is the largest area of this column, coloured black, where bacteria that uses all the sulfur from the bottom appears. Consequently, there is no intermediate zone in which the sulfur is oxygenated. This area is anaerobic.
The top is aerobic and it is where bacteria transform oxygen. This area is very small compared to the other two.
Moving forward in time, more changes will be seen in the column, as well as bacteria continuing to grow.

Ana García Ramos, Carlota Borne Bernal, Ernesto Segundo Mendoza, Maria del Carmen Espinosa Corona and Pablo Carrasco Ercilla.

Wednesday, 17 May 2017

UCA_E7-8_1


WINOGRADSKY COLUMN (first day)



Rio San Pedro sediment + 0,3 g NaCl + 0,3 K3PO4 + 0,4 g sugar + 0,4 g CaSO4

The purpose of this practice is to observe the color change and the increase of microorganisms over time in a medium created by ourselves with the reactives elements mentioned above.

We introduce the same mixture of the same quantity into two different tubes. One of them will be exposed to light and the other will not.


Then, we will explain why we have added each of the aforementioned compounds:


  • The sucrose is added to bring carbon to the medium as every living thing needs a source from which it can obtain it.
  • CaSO4 provides sulfur to the medium. It will allow energy-capturing bacteria to grow through the reduction of this.
  • With the addition of K3PO4 we are contributing with phosphorus to the medium, which is used by microorganisms for their metabolism and it is an essential macronutrient for the growth and development of living beings.
  • We added NaCl to have a more saline medium than we had originally, and thus favor the growth of halophilic bacteria.



          
In this image we can observe the state of our tubes immediately after the deposition of the mixture in them and therefore they present a homogeneous and compact color throughout the column.


The tube that is in contact with the sun has a different development than the one that is not.


Over time, we will see different colors and changes in our column due to the growth of microorganisms. These variations can be seen because each bacteria will grow under the conditions that are most favorable to them along the column.


Ana García Ramos, Carlota Borne Bernal, Ernesto Segundo Mendoza, Maria del Carmen Espinosa Corona and Pablo Carrasco Ercilla