1 By convention a normal lens on a 35mm film camera (and thus a full-frame EOS digital SLR) has a focal length of 50mm or so. 2  A lens with a focal length of 35mm is considered ânormalâ for a cropped-frame EF-S camera.
Aspirin. One of the best known aromatic acetates is acetylsalicylic acid, or aspirin, which is prepared by the esterification of the phenolic hydroxyl group of salicylic acid. Aspirin possesses a number of properties that make it the most often recommended drug.
Acetylsalicylic acid (aspirin) is a derivative of salicylate, which can be found in such plants as willow trees and myrtle. Aspirin is one of the most commonly used drugs for the treatment of mild to moderate pain, as well as migraines and fever.For the treatment of moderate to severe pain it is frequently used along with other opioid analgesic and other non-steroidal-anti-inflammatory drugs.cetylsalicylic acid (aspirin) is a derivative of salicylate, which can be found in such plants as willow trees and myrtle. Aspirin is one of the most commonly used drugs for the treatment of mild to moderate pain, as well as migraines and fever.