Nabil Wahbeh Berkeley, Calif., June 2 , 2009 To the Editor: The Israeli settlements are a key impediment to progress in the Middle East.
In this context, said Jack Murtha, a conservative Democrat who served as a marine for 37 years, American troops are now an impediment to progress in Iraq.
The chief impediment to progress in model making is that most of the processes that control friction, lubrication, and particularly wear are transient in nature.
Access to disease-associated cardiovascular tissues from patients has been a major impediment to progress in contrast to the diagnostic advances made by oncologists using gene expression on readily available tumor samples.
This is a tremendous impediment to progress in the space industry, and is also one of the primary factors that makes space missions so risky.
In the author's opinion, common misuses of the term "classification" form the greatest impediment to progress in the field of cancer genetics.
The stigma associated with breast cancer in many countries is a major impediment to progress in controlling the disease and it should be a priority to reduce this stigma and eventually eliminate it entirely.
An impediment to progress in this field has been that the mitochondrial Ca2+ transport proteins were not purified or cloned, and that use of the inhibitors of these pathways is problematic in living cells.
As such, a major impediment to progress in the discovery of risk loci for hearing in humans is the lack of control of the many environmental factors that affect hearing during the lifetime, and, to date, only a limited number of large-scale GWAS for hearing phenotypes have been undertaken in humans.
