Αποτελέσματα Αναζήτησης
Symbols representing physical quantities, units, mathematical operations and relationships, astronomical bodies, constellations, and the Greek alphabet.
- Frequently Used Equations
Frequently used equations in physics. Appropriate for...
- Frequently Used Equations
In microbiology, a colony-forming unit (CFU, cfu or Cfu) is a unit which estimates the number of microbial cells (bacteria, fungi, viruses etc.) in a sample that are viable, able to multiply via binary fission under the controlled conditions.
Symbols for physical quantities should be single letters of the Latin or Greek alphabet with or without modifying signs (subscripts, superscripts, primes, etc.). The two-letter symbols used to represent dimensionless combinations of physical quantities are an exception to this rule (see section 4.14 “Dimensionless parameters”).
Access 3 Physics units and the Intermediate 1 Physics units and course together with the SI unit of the quantity. the abbreviation for the unit used in Credit level examinations. In General level examinations full words are used for the units of all physical quantities.
Give at least three real-world examples why determining bacterial numbers is an important technique. Explain how the standard plate count approach works. Calculate CFU of an original sample. Explain how absorbance can be used as is a measure of sample turbidity and cell numbers.
The International Baccalaureate Organization (known as the IB) offers four high-quality and challenging educational programmes for a worldwide community of schools, aiming to create a better, more peaceful world. This publication is one of a range of materials produced to support these programmes.
The only way to understand dilution theory well is to practice it, so you should work practice problems until you feel confident in using dilution factors and calculating CFU/mL in original samples. You should also be able to determine the proper dilutions to use to obtain 30-300 colonies on a plate if the original number of CFU/mL in a sample ...
