reflux esophagitis has improved dramatically since PPIs became available in 1989. PPIs provide rapid symptomatic relief and heal-ing of esophagitis in the highest percentage of patients. A systematic review of 7 trials that evalu-. Esophagitis Asthma Reflux in infants with laryngomalacia: results of 24-hour double-probe pH monitoring. Otolaryngol Head Neck Surg 1999; 120:860.
Soon after, John Wright of Birmingham, England discovered that potassium cyanide was a suitable electrolyte for gold and silver electroplating. Wright's associates, George Elkington and Henry Elkington were awarded the first patents for electroplating in 1840.
There are several types of gold plating used in the electronics industry: 1  Soft, pure gold plating is used in the semiconductor industry. The gold layer is easily soldered and wire bonded. 2  Bright hard gold on contacts, with Knoop hardness between 120-300 and purity of 99.7-99.9% gold.