GLAUCOMA has been reported to be common in many tropical countries, observations having been based on various criteria. Elliot (1920) noted that in the Madras Eye Hospital the proportion of surgical operations for glaucoma and cataract were in the ratio of one to four. Chang (1951) reported that 1 75 per cent. of 13,807 ophthalmic out-patients in Peking suffered from primary glaucoma. Dodds (19...

The intensification of the gold thiourea leaching from a filtration waste (Košice, Slovakia) using mechanical activation as the pretreatment step has been studied. The leaching of “as-received“ sample in an acid thiourea solution resulted in 65 % Au dissolution. However, after mechanical activation in a planetary mill 99 % of the gold was leached. The optimum redox potential for electrolysis is...

Semantic relation extraction is one of the frontiers of biomedical natural language processing research. Gold standards are key tools for advancing this research. It is challenging to generate these standards because of the high cost of expert time and the difficulty in establishing agreement between annotators. We implemented and evaluated a microtask crowdsourcing approach that can produce a ...

Conventional leaching (extraction) methods for gold recovery from electronic waste involve the use of strong acids and pose considerable threat to the environment. The alternative use of bioleaching microbes for gold recovery is non-pollutive and relies on the secretion of a lixiviant or (bio)chemical such as cyanide for extraction of gold from electronic waste. However, widespread industrial u...

Tarnishing, corrosion and stress corrosion cracking (SeC) of gold alloys are related phenomena. They present problems when they occur in gold jewellery, dental gold alloys and electronic devices. They are exploited, however, in the depletion gilding and finishing of gold jewellery; and in the extraction, refining and fire assaying of gold. There is still much that is not known about these pheno...

1S.1 General Principles 15.1.1 The chemistry of gold compounds Gold is the most noble of all the metals and this .is the key to both its eternal romance and its many practical uses in industry. It is the only metal, for example, that is not attacked in air or water by either oxygen or sulphur, and its durability under the most corrosive conditions has led to its widespread use in coinage and je...

Gold has both private uses (depletion uses and service uses) and government uses. It can be obtained from mines with high extraction costs (about $300 per ounce) or from aboveground stocks with no extraction costs. Governments still store massive stocks of gold. Making government gold available for private uses through some combination of sales and loans raises welfare from private uses by remo...