Manipulation (follow the links through "techniques" and "amplifying DNA")
The following links are helpful places to do further investigation into good writing:
The Science of Scientific Writing - A very useful article that analyzes the structure and style of scientific writing.
Writing Up Research - A fairly comprehensive explanation of the components of the research article from the Asian Institute of Technology.
Writing in the Neurobiological Sciences - A scientific writing course from the University of Florida with many useful links.
Writing Guidelines for Engineering and Science Students - A useful resource on scientific writing from Virginia Tech. Includes many examples and additional links.
Instructions to Authors in the Health Sciences - This site provides links to instructions to authors for over 3,500 journals in the health and life sciences.