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12y ago

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How many milligrams of caffeine do you need to wake-up the nervous system?

Caffeine has a stimulating affect on the heart, not the nervous system. An oral dose of 200 mg caffeine appears to decreasereaction time by approximately 4 percent within 30 minutes, approximately 15 percent in 30 to 60 minutes and 18 percent in 60-90 minutes.Therefore caffeine does not wake up the nervous system.


What is 90 percent -95 percent of the cell cycle?

The difference between 90% and 95% of the cell cycle is 5%. This means that 5% of the cell cycle is not overlapping between those two percentages.


What is the percent of teens that have cell phones?

The average number is around 90%


A cell spends approximately 90 percent of its cycle in?

Interphase. actual cell division is relatively quick in comparison


If you have a cell with water concentration of 90 percent and solute concentration of 10 percent and you place it into a solution that is 80 percent water concentration and 20 percent solute concentra?

The cell will lose water by osmosis because water will move from an area of higher concentration (inside the cell, 90% water) to an area of lower concentration (outside the cell, 80% water). This movement of water will continue until the concentrations of water inside and outside the cell reach equilibrium.


What is the single cell organism along with seaweed is responsible for 90 percent of oxygen on earth?

Diatom


When the power of a system drops by 90 percent its dB value changes by?

-10


What is 90 percent minus 250?

90 percent of what?


Why do you use 70 percent alcohol and not 90 percent while microbial culture?

Ethanol creates pores in the cell membrane of the microbial cell by solubilizing the lipoproteins of the membrane. The activity of ethanol determines its concentration. If we 90 percent ethanol, the amount of ethanol molecules available to act upon the cell is more and it attacks the cell membrane from all sides. The dissolved lipoprotein forms a kind of layer around the cell, due to which the alcohol is unable to act further and cause damage to the cell. However, if we use 70 percent ethanol, the amount of ethanol molecules are few and it is not able to attack the cell from all sides. Thus, pores are created intermittently in the plasma membrane, the ethanol penetrates the cell and damages it completely. So, 70 percent ethanol is preferable to 90 percent when using microbial cultures.


What is 90 percent of 90?

"90 percent" means 0.9, and "of" in arithmetic usually means "times". 0.9 x 90 = 81. 90 percent of 90 is 81.


Forty is what percent of 90?

FORTY IS WHAT PERCENT OF 90? FORTY IS WHAT PERCENT OF 90?


What is 90 percent of 725.59?

100 percent is 725.59 90 percent is 653.031