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Improvement slows thereafter and some deficits may be permanent. There is controversy over whether small subsegmental PEs need treatment at all [102] and some evidence exists that patients with subsegmental PEs may do well without treatment. [64] [103] Once anticoagulation is stopped, the risk of a fatal pulmonary embolism is 0.5% per year. [104]
The standard gold bar held and traded internationally by central banks and bullion dealers is the Good Delivery bar with a 400 ozt (12.4 kg; 27.4 lb) nominal weight. However, its precise gold content is permitted to vary between 350 ozt (10.9 kg; 24.0 lb) and 430 ozt (13.4 kg; 29.5 lb).
The proportions of silver and gold can vary widely. Doré bars weigh as much as 25 kg. During the 19th century gold rushes, gold nuggets and dust were melted into crude gold bars mistakenly called "bullion" by miners. They were, more accurately, doré bars with higher contents of silver and other adulterants than the mints would accept.
16th century cupellation furnaces (per Agricola). Cupellation is a refining process in metallurgy in which ores or alloyed metals are treated under very high temperatures and subjected to controlled operations to separate noble metals, like gold and silver, from base metals, like lead, copper, zinc, arsenic, antimony, or bismuth, present in the ore.
The gold bars held in the depository are approximately seven inches long, three and a half inches wide, and one and three-quarters inches thick. While each of these bars contains the equivalent of about 400 troy ounces (12.4 kilograms) of pure gold, they differ in their composition.
In aqueous solutions, redox potential is a measure of the tendency of the solution to either gain or lose electrons in a reaction. A solution with a higher (more positive) reduction potential than some other molecule will have a tendency to gain electrons from this molecule (i.e. to be reduced by oxidizing this other molecule) and a solution with a lower (more negative) reduction potential ...
In fact, if you're used to staring at REIT P/E ratios of 30-50, you'd probably think REITs are downright cheap when you look at P/FFO. A REIT's P/FFO is a really good way to work out a theoretical ...
The specifications of bullion are often regulated by market bodies or legislation. In the European Union, the minimum purity for gold to be referred to as "bullion", which is treated as investment gold with regard to taxation, is 99.5% for gold bullion bars and 90% for bullion coins. [2]