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The chronic toxic dose of selenite for humans is about 2400 to 3000 micrograms of selenium per day. [140] Hydrogen selenide is an extremely toxic, corrosive gas. [ 141 ] Selenium also occurs in organic compounds, such as dimethyl selenide, selenomethionine , selenocysteine and methylselenocysteine , all of which have high bioavailability and ...
A metric prefix is a unit prefix that precedes a basic unit of measure to indicate a multiple or submultiple of the unit. All metric prefixes used today are decadic.Each prefix has a unique symbol that is prepended to any unit symbol.
If its temperature is allowed to change by 1 °C, its mass changes by 1.5 picograms (1 pg = 1 × 10 −12 g). [note 5] A spinning ball has greater mass than when it is not spinning. Its increase of mass is exactly the equivalent of the mass of energy of rotation, which is itself the sum of the kinetic energies of all the moving parts of the ball.
As the spleen (150 g) and the liver (1.3 to 3 kg) are much smaller than the rest of the body, if the polonium is concentrated in these vital organs, it is a greater threat to life than the dose which would be suffered (on average) by the whole body if it were spread evenly throughout the body, in the same way as caesium or tritium (as T 2 O).
The current OSHA standard is 2 micrograms per cubic meter of air averaged over an 8-hour work shift. [92] The National Institute for Occupational Safety and Health has set a recommended exposure limit (REL) for platinum as 1 mg/m 3 over an 8-hour workday.
Hence, the uncertainties in the SI values of the Planck units derive almost entirely from uncertainty in the SI value of G. Compared to Stoney units , Planck base units are all larger by a factor 1 / α ≈ 11.7 {\textstyle {\sqrt {{1}/{\alpha }}}\approx 11.7} , where α {\displaystyle \alpha } is the fine-structure constant .
It also features higher flowing cylinder heads sourced from the L92, a more aggressive camshaft with 0.551 in (14 mm) lift, a 10.7:1 compression ratio, a revised valvetrain with 0.236 in (6 mm) offset intake rocker arms, a high-flow intake manifold, and 47 lb (21 kg)/hour fuel injectors from the LS7 engine.
In 2023, Shanghai's tourism industry generated an added value of CN¥177.12 billion (US$24.53 billion), marking a remarkable 98.5% increase compared to the previous year. The city welcomed a total of 3.64 million tourists, a 4.8-fold growth compared to 2022. The number of foreign tourists reached 2.41 million with a 5.2-fold increase. [155]