Which microscope is used primarily to view unstained spirochetes?

The first amino acid of a new polypeptide chain is

What is the average speed of a car that traveled 300.0 miles in 5.5 hours

In an experiment examining the effects tai chi on arthritis pain, callahan (2010) selected a large sample of individuals with doctor-diagnosed arthritis. half of the participants immediately began a tai chi course and the other half (the control group) waited 8 weeks before beginning. at the end of 8 weeks, the individuals who had experienced tai chi had less arthritis pain that those who had not participated in the course.