Bryn

maybe that means you have to ahve no mass in order to travel at the speed or light rather than infinite mass

Aliens would have to be friendly wouldn't they. Unless they were so far in advance of us we appeared like dumb cows to them, then they may just eat us, or worse "milk" us for something :oO. Imagine if seamen turned out to be a powerful narcotic to aliens so they put all the males on milking machines, and forced the women to always be pregnant with fresh males.

http://news.bbc.co.uk/2/hi/americas/3707057.stm It'd be nice, but I find it hard to beleive there are any aliens within resonable travel distance of earth if we havn't picked up any sorta stray signals/broadcasts from them. Anyone got any ideas on how aliens would communicate in such a way that would be undetectable to us? I'm sure it's possible if you set out to do it, but why would aliens set out to hide there transimissions? When they first start making them, such as with our TV and radio, they wouldn't know there was anyone to hide it from. They'd just be looking for the best form of communications. Evan if they were telepatheic, to achieve mass communication they'd need to boost there telepathic signals, which we would detect.

Basicaly it is because its a polar molecule. The 2 hydrogren are partially positive and the oxygen is partially negative (O has greater electronegativity than H). This allows it to dissolve other polar molecules. It also gives electrophiles and nucelophiles something to attack so that the water can be split. As it is polar it also results in hydrogen bonds between the water molecules, making it liquid at room temperature, when the other group 6 hydrides are gas (well SO2 is anyway, the rest are as rare as elvis shit so it don't really matter bout them), and it needs to be liquid to do it's job.

x^3 - 4x^2 - 25 has a factor (x-a). Find the value of a. I've tried two methods for this. The first one basically went f(a)= a^3 - 4x^2 - 25 = 0 SQRT(a^3 - 4x^2 - 25) = 0 a^(3/2) - 2x - 5 = 0 dunno where to go from there. The other method i tried was something like x^3 - 4x^2 - 25 = (x-a)(bx^2 + cx + d) = bx^3 + cx^2 + dx - abx^2 -acx -ad = bx^3 + (c-ab)x^2 + (d-ac)x -ad Equate coeffecients: b = 1 c-ab = -4 c-a(1) = -4 c-a = -4 d-ac = 0 ad = 25 I've then tried various combinations to try to get an answer for any of the letters but to no avail. The answers is apparently a=5 but afaik a^(3/2) - 2x - 5 = 0 (from first attempt) is correct and when i substitute a=5 into that it doesn't =0. Any help appreciated, evan if it's just to confirm that the text book is wrong.

provides a medium in which many essential reactions can occur. Provides the electrons required during photosynthesis, which in turn produces the oxygen given off that is required by other organisms Acts as a transport medium for nutrients, waste, and heat. Provides strength and shape to eukaryotic cells (e.g. mammalian cells). Provides a mean of temperature control, by distruputing heat as above, and in the removal of heat by sweating/evaporation.

Excerlent book if you havn't, well worth it. Just one question for those who have read it. When Dave and Jon are fighting on the bridge in edinburgh, and the van pulls up, who the fuck is in the van and what has it got to do with the story? it is never mentioned again.

light doesn't have mass afaik, otherwise it would be incapable of moving at the speed of light.

1. used to form bonds (if electribs are electrons). 2. One (the elctrons in the outermost shell) 3. Seven. It's Valence is however one, as it only has room to accept one more electron, and to form bonds it will normally need to accept as well as give an electron. It will rarely used all 7 out electrons to bond. 4. Two (two electrons in outmost shell) 5. Alkali metals

If this is possible is there a finite amount of light you can put into a finite amount of space or is the amount of light you can store infinite?

arrg, my html is rusty as a very rusty thing, but you get the idea i'm sure.

i have so far done this [pre] Statistical test I will be using an paired t-test for my statistical test. My null hypothesis is:- The size of the zone of inhibition caused the antibiotic is not influenced by the gram type of the bacteria. Let G+ represent gram positive and G- represent gram negative Ampicillin n = 9 Mean of G+ = (4+3+4+5.5+5+6+7.5+7+6.5)/9 = 48.5/9 = 5.389 G+ G+ - G+ (G+ - G+)2 (G+ - G+)2/n 4 -1.389 1.929 0.214 3 -2.389 5.707 0.634 4 -1.389 1.929 0.214 5.5 0.111 0.0123 1.37 x10-3 5 -0.389 0.151 0.0168 6 0.611 0.373 0.0415 7.5 2.111 4.457 0.495 7 1.611 2.596 0.288 6.5 1.111 1.235 0.137 Total = (s+2) 2.043 Mean of G- = (0+0+0+0+0+0+4+4+4)/9 = 12/9 = 1.333 G- G- - G - (G- - G-)2 (G- - G-)2/n 0 -1.333 1.778 0.198 0 -1.333 1.778 0.198 0 -1.333 1.778 0.198 0 -1.333 1.778 0.198 0 -1.333 1.778 0.198 0 -1.333 1.778 0.198 4 2.667 7.111 0.790 4 2.667 7.111 0.790 4 2.667 7.111 0.790 Total = (s-2) 3.556 t-value = G+ - G- = 4.242 s+2 + s-2 n I have n-1 degrees of freedom = 9 - 1 = 8 For 8 degrees of freedom the 5% limit is 1.860. I have a value larger than this so I reject my null hypothesis, the gram type of the bacteria does influence the action of ampicillin. [/pre] and presumbable iu just do this for each antibiotic?

I need to perform a paired t-test on the following data (i thinki, it might be unpaired???) the null hypothesis is "The size of the zone of inhibition caused the antibiotic is not influenced by the gram type of the bacteria". Any help plz plz! p.s. E.coli, and the two pseudomonas are gram negative and the rest are gram positive.

Also are there crosslinks inbetween pepdidoglycan layers in gram negative cell walls or is it just one layer thick (wondering why penicillin is not effect against gram negative bacteria).

I need a list of bacteria that cause chest infections please. Google is be unhelpful for once, any help please?

c 2.5 metres

tbh i doubt they have done it, there crack pots. The only real issue involving human cloning, or any cloning of an intelligant animal, should be the risk to quality of life for the clonded individual. Dolly was one short lived sheep, out of almost 300 embryos. Many aborted late in pregnancy, and some died after birth. That is unacceptable for a human and tbh for a sheep as well. The first time someone does clone a human will probably be illegally and end in failure. But once it's been done, and suceeded, it will open the flood gates. It's just a question of someone with questionable moral fibre doing the first couple. I only hope by the time it comes common practice we have a little more living space than this rock, otherwise it's gona get rather cramped.

ah ok, i was on the right track afterall. I just forgot to square what i subsiuted in for m, i just multiplied by 8 and then used the quadratic formula on the resulting equation, which gave me the surd.

yea but how long are we talking? is it a hundred years? a thousand years? or evan longer. I'd be quite happy with 1000 years, tho i'd like longer tbh.

When 1 is added to the numerator and the denominator of the fraction m/n the new fraction is 3/2. When one is subtracted from the numerator and denominator of the fraction m^2/n^2 the new fraction is 21/8. Find the possible values of m and n. The values i get for n and m are surds, but the answer is apparently m=8 and n=5, which do work. I wont post my working cos i'm pretty sure i'm totally off track. Any help plz?

I don't think it's outside the realms of possiblity for us to be able to replace to entire human body (apart from the brain) with custom grown organs or machines, within our lifetime. Wot i'd like to know is does the brain age in the same way as the rest of the body? it's not undergoing mitosis so there's no shortening of the telomeres. I've also seen studies that suggest the brain of a 90 year olds is as good as a 20 years old provided they have the same levels of motivation and presumably the rest of the body is keeping the brain well surpported. so how long would the brain survive if it was the only part we would have to worry about?

are that's it, so easier once i knew to factorise it, must remeber to look out for that. Thanks.

4sinxcosx-2sinx-2cosx+1 = 0 Need all solutions in the range 0 < x <=360 Just a clue would be nice, i'm totally flummaxed. question 22 of excercise 2c in the edexcel p1 book if you have it.