Identifying new models for human eye diseases By Sara Cassidy, M.S., Ph.D. Although it is difficult to measure the impact of chronic conditions like eye disorders, Prevent Blindness America estimates that eye disorders and vision loss cost $139 billion in 2013, placing these conditions among the most expensive health disorders in the US.
Curing deadly engine vacuum leaks. Vacuum leaks can be located with spray carburetor cleaner or a can of WD-40. If the area is obstructed by linkage or hoses, use an extension nozzle to pinpoint the area of the vacuum leak.
A combination of pneumatic and hydrostatic testing, where low pressure air is first used to detect leaks. Initial service testing, which involves a leakage inspection when the system is first put into operation. Vacuum testing, which uses negative pressure to check for the existence of a leak. Static head testing, which is normally done for drain piping with water left in a standpipe for a set period of time.