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Hello, I am taking a graduate level biochemistry course and I have been struggling with it a little bit. It's been quite a while since I took General Chemistry and I never took Organic, although I have been trying to self-teach myself Organic Chemistry.

Right now we're discussing the chemical kinetics of enzymes and I have what might be a stupid question. I'm starting to think that everybody knows what this is except for me because I can't find it defined anywhere. Anyway, in the textbook I'm using it presents the equation for the velocity (v) of the reaction A ----> P as:

v = d [P]/dt = - d [A]/dt = k [A]

So.... it defines what v is and that the brackets equal the concentrations of the reactants and products, but it is not telling me what this "d" and "t" parts mean! I'm guessing t is time (or maybe temperature) but what is d? I'm very confused!

Thanks in advance for help!

I just read this article and am now completely and utterly confused:

http://news.yahoo.com/s/yblog_upshot/20100915/el_y...

I thought the tea party people were conservatives? So why are they a threat to the republican party? And if they're not republicans and they're not democrats and they're definitely not moderate then what the heck are they?

Whenever I open my iTunes I get this warning:

Warning! The registry settings used by the iTunes drivers for importing and burning CDs & DVDs are missing. This can happen as a result of installing other CD burning software. Please reinstall iTunes."

Now I'm just a little confused because everything seems to be working as normal. I have not tried to burn a CD yet (I don't use iTunes for that, and for some reason my laptop does not want to burn CDs no matter what software I use - unless this is causing that problem?) Anyway, but when I go to import a CD everything works fine and all my data is still here. Do I actually need to reinstall or can I ignore this message?

Also, if I have to reinstall itunes will I lose everything I've imported - cuz I have like 6000 songs and I REALLY don't want to have to do all that again.

Thanks!

Ok so this is kind of gross, but I'm having trouble finding an exact answer on google. I was making my bed today and found this big stain on my mattress. It's right underneath the upper part of my body on the side of the bed where I sleep. I live alone, have never done anything but sleep in the bed, btw. It is like some kind of pale orange/brown color that looks like maybe the edges of a liquid stain. It is only dark around the edges looking like someone drew a big circle and did not color it in. Is this just a sweat stain? Is that normal? It's just that the stain wasn't there last time I looked two months ago and now it is, and it seems that it didn't affect the mattress pad at all, somehow went through it without staining it and affected the actual mattress only. Is this because my mattress pad is made of something that doesn't get stained but my mattress is not?

I'm slightly paranoid and just want to make sure I don't have some kind of disease or something. I know that sounds silly. The past couple nights I have woken up very sweaty though, as the weather is becoming warmer and I hadn't yet turned on my air conditioning.

I'm a 25 year old master's student trying to finish up my thesis. I have had procrastination problems all my life and though I thought I was on track I am feeling more and more like I'm running out of time and am getting really scared and depressed.

Lately I've had a very hard time doing ANYTHING at all, especially since I feel like whenever I try to get something done I work my a** off and I feel like I don't get anywhere, no matter how hard I try. So then I just quit and don't do anything for awhile, and I feel like I can't function. Then when I finally start to try again, again I get nowhere and I give up some more. I feel like I'm so behind and I've started to have frightening and irrational thoughts. I'm already past the deadline of when I'm supposed to hand in the next draft of my thesis and I'm terrified that my advisor is going to be furious with me and I'm convinced that "they" are going to take away my fellowship that I got for a Ph.D. study later this summer. I'm convinced that I'm a failure and I suck and I don't deserve the fellowship or to go on for a Ph.D. and I'm sure that people are going to "discover" this and then take it away from me and I'll have no future.

I know these thoughts are somewhat irrational but I feel like they're taking over my life. I have been trying to fix my procrastination problem for months now and I feel like I've gotten NOWHERE. I have been on medication for depression, found out I had sleep apnea and am trying to get used to the BiPAP machine they gave me, but it's hard to do and I'm freaking out because I feel like I don't have time to get used to it and I want it to start working perfectly RIGHT NOW, but it won't.

I've had four panic attacks in the past 5 days where I start crying uncontrollably, screaming, choking, almost throwing up, hyperventilating, shaking, can't focus, etc. I am NOT suicidal nor have I ever been suicidal. I just want to get better but I have no idea how to get any help. I'm wondering if I should go to a clinic or hospital but I'm afraid about the legal issues or red tape involved, plus I feel guilty like I'm just using it as an escape mechanism to get sympathy or more time to finish my thesis. That makes me feel like a slack-off, lazy failure again and just makes me more upset and makes it harder to get any work done. I feel like a frozen zombie half the time and I'm completely miserable. I keep telling myself it will get better but it just keeps getting worse.

I keep thinking it can't get any worse but it does. Lately I've stopped even trying to think things are going to get better because it feels like some kind of a jinx, because every time I start to feel motivated or like things are finally taking a turn for the positive, it never lasts and things only get worse again.

Does anyone have any advice for this? Any way for me to get motivated, stop being scared, etc? Has anyone had similar issues? Is this just "normal" for someone trying to finish up a thesis? I'm going to talk to my psychologist tomorrow but tonight I'm trying to work on my thesis some more but I just feel like I can't do it, and I'm desperate for any kind of advice/support as soon as possible. I'm embarrassed to talk to friends/family about this because I don't want anybody to find out how behind I am right now.

Please help! Okay I know this has probably been a pointless thing to ask seeing as I'm going to see my psychologist tomorrow but I just needed to vent/get this out in the open, I don't know. Anyway, thanks...

Hello, I recently purchased two female pet mice. Everything is going fine so far, but I'm a little concerned because one of my mice seems to be overweight... especially when comparing her to my other mouse. I'm not sure if I should be worried or not. I don't know her exact weight since I don't have a scale that will measure that low. I've been feeding them a seed mix and I plan to switch (slowly, of course, bit by bit) to a food pellet that is more nutritionally balanced. But aside from that I haven't been able to find any good information online about what to do with an overweight mouse that is a pet. I'm a bit worried about her health. She also doesn't run on the wheel as much as the other mouse does, and not as fast either. I'd really appreciate any advice about exercises, food, etc., that might help my mouse lose some weight. Thanks!