Микробиология и биотехнология

Fermentation of molasse to ethanol with yeast

Principle

As a result of the need to save energy and the increased consciousness of environmental problems, biotechnological production methods are on the advance. Fermenters are used for the biotechnological production of enzymes and other products using bacteria, yeast and cell cultures. For ...

We visit a wastewater treatment plant

Principle

A visit to a water treatment plant reveals some fascinating procedures and purification methods. We will not merely be concerned with interesting impressions, but instead we will increase our understanding for microbiological processes by measuring the key parameters: ...

We visit a wastewater treatmen plant with SMARTsenset plant

Basic methods in imaging of micro and nanostructures with AFM (Atomic Force Microscopy)



Principle

Approaching a sharp silicon tip mounted on a cantilever to a sample surface leads to an atomic scale interaction. The result is a bend of the cantilever which is detected by a laser. In static mode the resulting deflection is used to investigate the topography of the ...

Microbial decomposition of mineral oil

Some microorganisms living in soil and water are capable of utilizing mineral oil compounds as carbon and energy sources. They break down these compounds to produce carbon dioxide and water, thereby decomposing mineral oil. Particularly mycobacteria, corynebacteria and ...

Fundamental microbiological working methods

Principle

In order to prevent nutrient media and cultures from being contaminated with microorganisms that adhere to the working equipment, the equipment, nutrient media, and nutrient solutions must be sterilised. Petri dishes filled with a solidified nutrient medium are called plates in the ...

Evidence of the spread of bacteria

Principle

Microorganisms are ubiquitous, i.e. they are present everywhere around us. This fact can be proved by touching the objects that are to be examined in view of the presence of microorganisms against the sterile nutrient medium in a Petri dish and by incubating the plates ...

Determination of the microbial count

The microbial count is the number of viable microorganisms in one millilitre or gramme of the material to be examined, e.g. water, soil, milk, ice cream, etc. It is of high practical importance for the analysis of drinking water, soil, and foodstuffs. The
microbial count can only ...

Evidence of the effect of antibiotics, chemotherapeutics and disinfectants

Principle

Evidence concerning the effect of substances inhibiting the growth of microorganisms, e.g. antibiotics, chemotherapeutics, and disinfectants, can be provided by treating cultures with the substances to be studied and by observing the growth of the microorganisms. Evidence concerning ...