1. Repetition of key information
Example: Antibiotic resistant microorganisms have significantly compromised antibiotic treatment. A large proportion of resistance in Gram-negative bacteria can be attributed to…
2. Beginnings and ends of sentences: also called old/new information
Example: Peanut allergy is one of the most severe allergies because of its life-threatening character. A trace of peanuts can trigger an abnormal immunological reaction ranging from nausea to anaphylactic shock. Anaphylaxis reaction is a severe response for hypersensitive individuals.
3. Transition words
Example: The use of aluminium as p-type dopant has two major disadvantages, however. Firstly,… Secondly,… In comparison, boron diffusion is able to achieve a high peak concentration, and allows good control over the doping profile.
4. Using pronouns to refer to information
Example: Subcritical water can be used as a fluid for effective drug delivery device processing. It has recently been found to be an effective eluent… This has great potential for the delivery of drugs particularly for cancer patients.
For more examples of linking ideas see Making a Case Study Report Cohesive.