Spotty Spootum

Here's the biochem question:

In an experiment using 3.4 uM enzyme, the total concentration of inhibitor needed to inhibit the reaction by 50% was 6.3uM. What is the dissociation constant, Ki for this compound?

uM - nano Molar

I really don't know how to go about solving this. For starters what does Ki even equal?

I have some work done but I have no clue if it is remotely correct

1. 3.4uM / 2 = 1.7 uM enzyme (50%)

2. 6.3uM-1.7uM = 4.6 uM --> free Inhibitor

3. Ki = 4.6 [I] / [EI] --> Ki = 4.6 uM

Is this correct or way off? Any help it greatly appreciated.

As the osmolarity of an animal's (crayfish for example) environment increases toward its plasma osmolarity, adjustments in these fluxes must occur. Indeed after prolonged exposure to a surrounding of high osmolarity, an increase in the amount of free amino acids in the cells is seen; a process which will clearly allow the organism to survive at higher ambient osmolarity. Why?

I really don't understand why amino acids in a cell can have this effect. Any credible help is greatly appreciated. Thanks

This is pretty specific, in that I would like to throw a foam + fog + blacklight + laser light show party. My plan is to have a part of the basement, where our DJ is playing music, be the location for the foam. The laser lights will be in this area as well. However I have no experience with this before so I don't know whether foam would go good along with fog. Also would the laser lights overpower or not show up as well in a blacklight environment?

• Would these work together: Fog + Foam & laserlights + blacklights ???

Please if you have attended a party that used either of the above two conditions in conjunction with one another, how'd you rate it???

Thank you for your time.

Hey everyone. I'm planning a party and I have black lights that I will use with a fog machine. However I want to purchase some laser lights as well. Does anyone know whether the two can work together (meaning one does not overpower the other) ? I would like to see the black light effect as well as a laser light show in the fog.

By the way I plan to purchase this for a laser show:

http://www.guitarcenter.com/American-DJ-Micro-3D-L...

If you have any better suggestion for laser lights that would not break a budget (preferably not exceed $150) please provide, thanks!

If 12.31 grams of benzoic acid is allowed to react with 6.0 moles of methanol and 12.72 grams of methyl benzoate are isolated, what is the percent yield for this transformation?

Please any help on how to solve this would be greatly appreciated. Thanks!

A student performs an esterification reaction between benzoic acid and methanol to give methyl benzoate and water. The student starts with 1.15 moles of benzoic acid and 8.6 moles of methanol. At the end of the reaction 0.25 moles of benzoic acid are recovered. How much water is present at equilibrium?

Any help how to start and set this solution up would be greatly appreciated. Thanks!

At the present time, the planet Saturn orbits the Sun at a radius of 9.54 A.U. and has an orbital period of 29.5 yrs. If Saturn were moved into a new orbit with a radius of 0.3 A.U., what would its new orbital period be?

a) It would not change because the orbita period only depends on the mass of the Sun

b) 62 hours

c) 60 days

d) 1.643 years

** I think the answer is A because when applying the equation M=a^(3) / p^(2), I got 0.997, approx. = 1. So wouldn't the mass of the planet Saturn be equal to the Sun's mass?

Just curious. I haven't had a flu shot in years, literally. I can't remember the last time I got one, and I'm 19 now. I'm pretty sure there are others out there that just never get flu shots. And probably like me, don't get sick. Anyway, since I don't get sick and never get the shot, I guess I have some immunity to it or something.

So should I just not even consider getting one ever?

Has anyone ever tried this? Curious about if you can do it safely (not dying).

(Mix Redbull+Monster+Nos+5hr energy) AND chug = ?????

AND has anyone survived, haha.

Find all the second partial derivatives.

f(x, y) = (sin(mx + ny))2

fxx(x, y) =

fxy(x, y) =

fyx(x, y) =

fyy(x, y) =

I thought that fxx(x,y) would be 2m^2, but it was wrong. So I really don't understand how to solve this problem. Any help is greatly appreciated. Thanks.

Hi, I have a 13" 2010 Macbook Pro model. I have the 250 GB HDD but I'd like to upgrade to a 1TB drive if possible. So I was wondering whether anyone reading this has any suggestions for where to buy a good 1TB drive. I was thinking Newegg.com, any suggestions are fine though.

**Also I think I've read somewhere that a 1TB or similar size drives can maybe run slower or stop working after a while. Is this true?**

A child is in danger of drowning in the Merimac river. The Merimac river has a current of 3.1 km/hr to the east. The child is 0.6 km from the shore and 2.5 km upstream from the dock. A rescue boat with speed 24.8 km/hr (with respect to the water) sets off from the dock at the optimum angle to reach the child as fast as possible. How far from the dock does the boat reach the child?

I have no idea how to go about solving this prob. So Any help is greatly appreciated. Thanks

Ok I've had tried over and over again to try to solve this problem. I'm just not getting any right answer. Maybe I'm not using the correct formula, anyway I just want to know how I can solve this. It's been getting me frustrated a bit trying to solve it and never getting the right answer. So any help is greatly appreciated, thanks!

Problem:

Ted Williams hits a baseball with an initial velocity of 120 miles per hour (176 ft/s) at an angle of θ = 35 degrees to the horizontal. The ball is struck 3 feet above home plate. You watch as the ball goes over the outfield wall 420 feet away and lands in the bleachers. After you congratulate Ted on his hit he tells you, 'You think that was something, if there was no air resistance I could have hit that ball clear out of the stadium!'

Assuming Ted is correct, what is the maximum height of the stadium at its back wall x = 565 feet from home plate, such that the ball would just pass over it? You may need:

9.8 m/s2 = 32.2 ft/s2

1 mile = 5280 ft

Ted Williams hits a baseball with an initial velocity of 120 miles per hour (176 ft/s) at an angle of θ = 35 degrees to the horizontal. The ball is struck 3 feet above home plate. You watch as the ball goes over the outfield wall 420 feet away and lands in the bleachers. After you congratulate Ted on his hit he tells you, 'You think that was something, if there was no air resistance I could have hit that ball clear out of the stadium!'

Assuming Ted is correct, what is the maximum height of the stadium at its back wall x = 565 feet from home plate, such that the ball would just pass over it? You may need:

9.8 m/s2 = 32.2 ft/s2

1 mile = 5280 ft

I thought that it would be 395.61 feet but I guess not.

Hi, well basically I'm not afraid of dying, because when I do I'm pretty sure everything will just black out. Quite like sleeping in a sense...Then whatever happens next, will be an added bonus.

I'm more so afraid, or I should say concerned with not living to my fullest potential. I don't want to just be a drone letting myself get sucked into the socially acceptable living styles (killing yourself to get a job, then doing the same to keep the job and a family, to ultimately retire old wishing I could have done more with my life). So I just want to make everyday worth something. No conforming, to an extent, and trying to be a difference in the world with my life.

Well those are thoughts on the matter. If you so happen to be reading this, feel free to post whatever thoughts you may have. Have a good day :)

Use the given points to answer the following questions.

A(1, 0, -3), B(1, 2, 3)

Find a vector a with representation given by the directed line segment from A to B.

‹ , , ›

Sorry I'm really having trouble with understanding this, so any help is greatly appreciated. Thanks!

Find an equation of the set of all points equidistant from the points

A(−2, 6, 4) and B(5, 2, −3).

Describe the set:

• a cube with diagonal AB

• a sphere with diameter AB

• a line perpendicular to AB

• a plane perpendicular to AB

I have no clue how to solve this so any help is greatly appreciated!

A tortoise and hare start from rest and have a race. As the race begins, both accelerate forward. The hare accelerates uniformly at a rate of 1 m/s2 for 5 seconds. It then continues at a constant speed for 11.7 seconds, before getting tired and slowing down with constant acceleration coming to rest 87 meters from where it started. The tortoise accelerates uniformly for the entire distance, finally catching the hare just as the hare comes to a stop.

How fast is the hare going 3.5 seconds after it starts? Answer: 3.5 m/s

I always have trouble with figuring out the acceleration.

How fast is the hare going 11.8 seconds after it starts?

How far does the hare travel before it begins to slow down?

What is the acceleration of the hare once it begins to slow down?

What is the total time the hare is moving?

What is the acceleration of the tortoise?

Any help is greatly appreciated. Thanks!

Two cars start from rest at a red stop light. When the light turns green, both cars accelerate forward. The blue car accelerates uniformly at a rate of 3.6 m/s2 for 4.5 seconds. It then continues at a constant speed for 7.3 seconds, before applying the brakes such that the car’s speed decreases uniformly coming to rest 201 meters from where it started. The yellow car accelerates uniformly for the entire distance, finally catching the blue car just as the blue car comes to a stop.

How fast is the blue car going 3.6 seconds after it starts? Answer: 12.96 m/s

How fast is the blue car going 8.8 seconds after it starts? Answer: 16.2 m/s

How far does the blue car travel before its brakes are applied to slow down? Answer: 154.71 m/s

These problems I had difficulty solving for. So any help is greatly appreciated. Thanks.

What is the acceleration of the blue car once the brakes are applied?

What is the total time the blue car is moving?

What is the acceleration of the yellow car?

Here's the problem:

Write the sphere in standard form.

2x^2+2y^2+2z^2=8x-24z+1

I got : (x-2)^2+(y-1)^2+(z-(-6))^2=40.5

I don't think I really understand how to solve this problem, so any help is much appreciated. Thanks!