A good site I found recently on writing lab reports.  It has many examples of good and bad writing:
http://www.union.edu/PUBLIC/BIODEPT/ResearchReports.html

Gram staining of bacteria:

http://www.uphs.upenn.edu/bugdrug/antibiotic_manual/gram.htm

Spectrophotometry:

This link has some background information and online experiments dealing with spectrophotometry http://www.chm.davidson.edu/ChemistryApplets/spectrophotometry/

More basic review of Spectrophotometry http://www.biology.lsu.edu/introbio/tutorial/Spec/spectrophotometry.html

Click on the links below for plasmid sequences:
pUC 8 sequence
pUC 18 sequence