Each scientific discipline has its own conventions and requirements. Students often make the mistake of thinking that writing skills will not be necessary in a science career, when in fact writing often plays a key role.
Overview
Writing in the sciences: how to make your writing more precise, clear, and objective.
Lab Reports
Writing lab reports: offers guidelines for each section and a few example reference formats.
Writing scientific research (lab) reports: this UNC-Chapel Hill-created resource is also helpful.
LabWrite: a step-by-step guide with leading questions that offers help on the writing you will do before, during, and after a lab. The resource is a bit clunky, but it's helpful.