Bacteria

Growing Microorganisms

Cultures of microorganisms (microorganisms grown in a lab) can be used to investigate the effects of antibiotics and disinfectants, which both kill bacteria. Microorganisms can be grown in two mediums (materials) that contain everything that bacteria need to survive.

Agar gel plate

Microorganisms can be grown as colonies on an agar gel plate.

Nutrient broth

Microorganisms can be grown within a solution of a nutrient broth.
This contains carbohydrates as an energy source, minerals and sometimes other chemicals.

Calculating Area

The equation for calculating the area of a circle is: Area = π x radius².

Clear-zones

Samples of certain antiseptics or antibiotics can be added to bacterial cultures. The area free of bacteria around the sample can then be calculated.
This technique is useful for testing how well different antibiotics work. It's also useful for identifying bacteria or other microorganisms based on the antimicrobials that affect their growth.

Bacterial cultures

The size of bacterial cultures can be measured by the area of the colony.
This is useful for determining how different conditions affect bacterial growth rates.

1Biology

1.1Practicals

1.1.1Microscope & Bacteria

1.1.2Bacteria

1.1.3Osmosis Tests

1.1.4Osmosis & Food Tests

1.1.5Enzymes

1.1.6Enzymes 2

1.1.7Photosynthesis & Plant Responses

1.1.8Photosynthesis Experiments

1.1.9Reaction Time

1.1.10Quadrats

1.1.11Decay

2Chemistry

2.1Practicals

2.1.1Salts

2.1.2Neutralisation

2.1.3Titration

2.1.4Electrolysis

2.1.5Electrolysis 2

2.1.6Rate of Reaction

2.1.7Rate of Reaction 2

2.1.8Chromatography

2.1.9Identifying Gases

2.1.10Identifying Gases 2

2.1.11Identifying Ions

2.1.12Carbonates, Halides & Sulfates

2.1.13Flame Emission Spectroscopy

2.1.14Water Purification

2.1.15Water Purification 2

3Physics

3.1Practicals

3.1.1Specific Heat Capacity

3.1.2Thermal Capacity & Insulation

3.1.3Latent Heat

3.1.4Resistance & Current

3.1.5Resistance & Current 2

3.1.6Density

3.1.7Density 2

3.1.8Force & Extension - Springs

3.1.9Waves - Ripple Tank

3.1.10Light

3.1.11Light Reflection & Refraction

3.1.12Radiation

3.1.13Radiation 2

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