Electric field – basic information
A volume in which there are forces acting on electric charges, is called an electric field. Such a field is created by the separation charges with different marks as a…
Homemade method for DNA isolation
To isolate own DNA in your kitchen, you need only a few things that you can easily find in almost every home - or easily to buy. Check if you have: dishwashing liquid, a teaspoon of salt, pure ethanol, a clean glass, fridge and a little bit of patience.
What is capsid?
Capsid is a protein shell that is part of the virus structure. It is made of identical elements called capsomeres. The capsid contains nucleic acid (DNA or RNA). Viruses are…
Huygens–Fresnel principle
Huygens–Fresnel principle (also known as Huygens principle) says that all wave front points can be considered sources of new spherical waves. The position of the wavefront after at time t…
Typical strains of bacteria for evaluation of bactericidal activity of chemical substances
Referenced bacteria strains most commonly used as a test organisms for determination of bactericidal activity are: Psudomonas aeruginosa (ATCC 15442) Escherichia coli (ATCC 10536) Escherichia coli K12 (NCTC 10538) Staphylococcus…
What is polarization of light?
Polarization (in physics) is limiting transverse wave vector vibrations to some direction. For non-polarised electromagnetic waves, such as visible light, the electric field vibrates in all directions perpendicular to the…
Piranha solution preparation
Piranha solution is one of the most commonly used laboratory glass cleaner. Its strong oxidizing agent and removes most organic matter. However, it should be remembered that due to its…
Aqua regia preparation
Aqua regia (other names: regal water, king's water) is a mixture of hydrochloric acid (HCl) and nitric acid (HNO3) in proportions of 3:1 (volume ratio). This liquid has orange color…
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