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PP123 - Serial dilutions for calculating population density of microbes
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A straight forward method of how to serially dilute a bacterial broth, and grow colonies, for calculating population density. 
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Free resource
Serial dilutions of bacterial broth
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This video demonstrates how to carry out serial dilutions of bacterial broth. Then making lawn plates for counting population density. 
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Members only resource
GL401 - Getting started - Microbiology
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A diagrammatic guide on how to get started with microbiology, outlining the key actions with links to associated guidance.
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Members only resource
GL269 Microbiology guidance index
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Briefly lists all CLEAPSS documents relevant to school microbiology.
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Members only resource
Bulletin 184 - Autumn 2025
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Welcome back to a new year, in this terms bulletin :-- Directors editorial- Welcome to new staff- Log in updates- The world of blob- Hazcard updates- International microscale symposium- 2026 MiSAC Com.. more
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Members only resource
GL206 - Fermenters and fermentation
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Updated from section 14 of the CLEAPSS handbook, this gives considerable detail on how to set up and manage fermentations in school science. It includes sections of safety, suitable organisms, and on .. more
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Members only resource
GL352 - Managing practical work in non-lab environments (COVID-19 pandemic)
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The CLEAPSS Helpline receives a number of calls about the teaching of science practical work in non-lab environments. In the normal running of a school we advise against doing this due to additional r.. more
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Members only resource
Handbook - Section 17 - Fieldwork
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Gives guidance on general fieldwork including specific measurements and techniques. Detailed guidance is included on measuring substances in the soil, water and air, and electronic measurements such a.. more
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Members only resource
Handbook - Section 7 - Chemical Safety
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General chemical safety information. Includes chemical names and formulae, with instructions for making common dilute solutions, general advice on storage, handling and disposal as well as guidance on.. more
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Members only resource
R035 - pH measurement
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Contains a wealth of information on the various ways of measuring pH, and the advantage and disadvantage os each. Includes all sorts of background theory which will help the reader make the most appro.. more
words matched: density, population
Showing results 1 to 10 of 117
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