# What is Rev: Definition and 22 Discussions

Rev is a transactivating protein that is essential to the regulation of HIV-1 (and other lentiviral) protein expression. A nuclear localization signal is encoded in the rev gene, which allows the Rev protein to be localized to the nucleus, where it is involved in the export of unspliced and incompletely spliced mRNAs. In the absence of Rev, mRNAs of the HIV-1 late (structural) genes are retained in the nucleus, preventing their translation.

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1. ### Automotive What happesn if you disconnect the driveshaft and rev the engine in Drive?

[Moderator note: This thread was moved from a HW forum. Hence the template. But it doesn't sound like homework.] 1. Homework Statement What will happen if i disconnect driveshaft from transmission and rev engine in drive? Homework Equations Rear end speed sensor could be play some role in...
2. ### Frequency of a proton moving in a circular orbit

Homework Statement Homework EquationsThe Attempt at a Solution [/B]Assuming that the relation ## v = \omega r ## is valid in relativistic calculation. As the speed is greater for higher kinetic energy, ## \omega_2 ## is greater. This is shown by only (d). So, I think (d) should...
3. ### Point charge outside a grounded conducting sphere

Homework Statement Homework EquationsThe Attempt at a Solution Option (a), because the potential is 0 on the surface, and potential due to point charge is positive so there must be negative charge on the surface. Since opposite charges attract each other, there is an attractive force...
4. ### Dispersion relation for a surface wave of a pool of water

Homework Statement Homework EquationsThe Attempt at a Solution ## v = \frac { \omega } k ## ## \omega = \sqrt{ kg \tanh (k) } ##I have no idea to guess the graph. I put g = 9.8 and tried to calculate ## \omega ## for different values of k. ## \omega (0 ) = 0, \omega (30) =...
5. ### What is the formula for calculating fringe width in an interference pattern?

Homework Statement Homework EquationsThe Attempt at a Solution When the system is in air ## d \sin {\theta} = n \lambda ## ...(1) When the system is in water and slit separation is 2d, ## \mu 2d \sin {\theta} = n \lambda ## ...(2) ## \tan {\theta} = \frac y D ## ...( 3)...
6. ### Change in the energy of photon due to recoil of the nucleus

Homework Statement Homework EquationsThe Attempt at a Solution Since energy of photon is very low compared to the rest mass energy of the nucleus, I consider non – relativistic calculation. Conservation of linear momentum gives : momentum of nucleus = momentum of photon = p...(1)...
7. ### What is the Resistance of a Loop in the Presence of Motional EMF and Gravity?

Homework Statement Homework Equations Flux rule: ξ= -dΦ/dt' F= ma The Attempt at a Solution Let's assume that the loop is going down with speed 'v <0'. Using Flux rule, ξ = - Bva Current will move in clockwise direction to increase Φ. The effect of magnetic force on AC gets canceled by the...
8. ### (UCM) Maximum Rev. Per Minute Using Length and Acceleration

Homework Statement An astronaut rotates at the end of a test machine whose arm has a length of 10m. If the acceleration she experiences must not exceed 5g (g = 10 ms^-2), what is the maximum number of revolutions per minute of the arm?Homework Equations T = (2πR)/v V = (2πR)/T Ac = V2/rThe...
9. ### Isothermal Expansion - Rev. or Irre. ?

Homework Statement Calculate the increase in internal energy of 1 kg of water at 100 degrees Celsius when it is converted into steam at the same temperature and at 1atm. The density of water and steam are 1000kg/m3 and 0.6kg/m3 resp. The latent heat of vaporisation of water is 2.25 x 106...
10. ### PV Graph Rev vs Irrev: Adiabatic Differences

What's the difference in the PV graph for a reversible process vs. an irreversible process? I know for adiabtic you would get a smooth (log like) downwards cruve if it's reversible but what about ireeversible? Thanks
11. ### Why ds=0 only in a steady rev. process?

Hello Why ds=0 only in a steady rev. process? Can't it be zore for a rev. and not steady process? And if the process isn't rev. but still circular. since the entropy is still a state function it should still be zero if we come back to the starting point ,right? if it isn't true then dU...
12. ### How many revolutions per second does a bike wheel make?

Homework Statement If the radius of the wheel on a bike is .25m, and has a velocity of 10m/s, how many revolutions does the wheel make each second?Homework Equations 2πr/rev The Attempt at a SolutionI solved this problem in terms of pi. First each rev moves the wheel 2πr which is 2π(1/4)=1/2π...
13. ### Rev Counter Problem need info on a signal divider

Hi i know that this is probably not the best place to look for help but i have been to a lot of forums with no real result . The problem i have is that we changed the motor on my car form a 4 cyl 2l witch gave me 2 pulses per revolution to a 2.5 v6 but this motor gives 3 pulses . its form a...

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15. ### He who has read paper Phys Rev. on Dynamical Model of Elementary Particles

He who has read paper Phys Rev. on "Dynamical Model of Elementary Particles" My question concerns the bound (collective) states from paper “Dynamical model of Elementary particles”. So the bound (collective) states are considered in chapter IV. I attach the file (extract from Y. Nambu and G...
16. ### Bearing failure rating? Simple rev counter?

Firstly I would like to point out I have absolutely no idea what I am doing and will most likely be blind or dead by tomorrow. But anyway. I've finally finished me first turbo jet engine (from scratch I would like to add and designed myself and dodgy as I am pretty convinced that it won't...
17. ### Bearing failure rating? Simple rev counter?

Firstly I would like to point out I have absolutely no idea what I am doing and will most likely be blind or dead by tomorrow. But anyway. I've finally finished me first turbo jet engine :approve: (from scratch I would like to add and designed myself and dodgy as :biggrin: I am pretty...
18. ### What sound does your cat powered car make when you rev it up?

http://www.cnn.com/2005/WORLD/europe/09/14/germany.catfuel.reut/index.html It only costs 23 euro cents (30 cents) a liter. 20 cats = 50 liters (11 gallons) Does anyone have a few spare cats they don't want anymore? --------- Bad Joke: What sound does your cat powered car make...
19. ### Current produced by rev of electron

I'm having a bit difficulty in understanding this question... In a Hydrogen aton, an electron goes round the proton at a rate of 7 x 10^5 rev/s in a circular orbit of radius 5.0 x 10^-11 What is the current produced by the revolution of electron? Well, the formula for current is Q/t and...
20. ### Angular Acceleration of a Cyclist's Wheels: 54 Rev in 10.0 s

A cyclist starts from rest and pedals such that the wheels of his bike have a constant angular acceleration. After 10.0 s, the wheels have made 54 rev. What is the angular acceleration of the wheels? Use units of "rad/s\^{}2". If the radius of the wheel is 36.0 cm, and the wheel rolls without...
21. ### Removing rev limiter on small two stroke

I have a zenoah g62pu engine on a scooter, about 62cc's. It has a rev limiter in the coil set at 12,500 i think. Id like to know how you could remove this. I have heard rumors of burning it out somehow, but no facts on it. It is a very small unit, maybe 1 square inch with a wire that goes right...
22. ### Converting Revolutions to Radians Per Second

Hello I have a question about converting rev to rad/s. If i had 1.13 revolutions for every 2.08s, how do I convert that into rad/s? 1.13rev/2.08s * 2pi ? Thank you for you help.