Announcement
Collapse
No announcement yet.
User Profile
Collapse

No commercial links, please
 1 post

It reads to me like all three requirements are minimums. Is there a problem if more than 200 ng is sent in? Is there value to conserving your DNA sample...
 2 posts

First, the floor load under the safe is 90 kg x 9.81 N/kg / (0.4 m x 0.45 m) = 4.905 kN/m² ( or kPa), nearly at the limit. Alternatively, the 5 kPa limit...
 3 posts
Leave a comment:

0.08% (generally the legal limit in US) is 0.08 g/dL or 80 mg/dL. Tighter limits apply to pilots, commercial drivers, underage drivers, etc.
...
 3 posts
Leave a comment:

2200 ft² x 1/3 ft x 1 yd³/27 ft³ = 27.2 yd³
However, it is delivered "loose" and will pack down over time. I would allow an extra 20%,...
 3 posts
Leave a comment:

Kilowatt hours of electricity? How is it produced? Some countries publish average figures for their mix of power plants, but it changes over time as...
 8 posts
Leave a comment:

8 ft x 8 ft x 1/12 ft = 5.33 ft^{3}
Dry sand is about 90 lb/ft^{3} so about 480 lb....
 2 posts
Leave a comment:

We need to determine the total mass in a 15 cm deep core 1 ha in size. A hectare is a square 100 m on an edge
1.5 g/cm^{3} x 15 cm x (10^{4} cm)^{2} = 2.25...
 2 posts
Leave a comment:

You need to know the molar mass (numerically equal to molecular weight). Wikipedia gives 177.29 g/mol
177.29 g/mol x 500 nmol = 88 645 ng or 88.6...
 2 posts
Leave a comment:

This is commonly known as the "digester problem." You weigh out a certain amount of a dry powder (grams) and mix it in a certain volume of liquid...
 3 posts
Leave a comment:

That gets into whether you are counting atoms or diatomic molecules, in other words, moles of what? There are two atoms of oxygen in a molecule of O2....
 4 posts
Leave a comment:

I'm not sure what units you are starting from as I don't understand the "at" in µgat. Can you explain what it stands for?
Never...Last edited by JohnS; 05292017, 02:21 PM.
 4 posts
Leave a comment:
No activity results to display
Show More
Leave a comment: