26

Physiology & Medicine / Re: MCAT exams

« on: 01/05/2004 20:04:07 »

Good luck Jay !!!!!

Angel

27

Chemistry / Copper (II) complex ion

« on: 30/04/2004 18:14:23 »

This question has been bothering me a while now, maybe Jay can put my mind at rest.

Copper (II) ions form the blue hexaaqua ion with water, [Cu(H2O)6]2+. On adding excess ammonia the blue colour changes into a beautiful deep purple as the tetraammine ion forms, [Cu(NH3)4(H2O)2]2+.

Ligand substitution occurs, but why are only 4 H2O ligands are replaced and not all six?

Angel

28

Just Chat ! / Re: Photoshop Wars!

« on: 01/05/2004 08:11:13 »

Sorry Justin but I thought this is rather cute.



Angel

29

Just Chat ! / Re: Photoshop Wars!

« on: 01/05/2004 08:09:50 »

The Naked Scientists present.....

MEN IN BLACK III !



Angel

30

Chemistry / Re: Sea water to H2 +O2... How is it done?

« on: 30/04/2004 07:43:31 »

Both Cl- and O2- are anions, would they react together to form other compounds? Like ClO-?
Or would Cl2 and O2 produced react with the anode? For example in the electrolysis of Al2O3, the oxygen produced at anode react with the carbon electrode to form CO2.

Angel

31

Chemistry / Re: Phase and state

« on: 26/04/2004 17:35:27 »

Thanks Jay. My teacher said that there are also aqueous and organic phase.

Angel

32

Just Chat ! / Re: What does everyone look like?

« on: 26/04/2004 17:27:28 »

Here's another one of Tom.



Nice Christmas cards on the wall.

Angel

33

Just Chat ! / Re: What does everyone look like?

« on: 26/04/2004 17:25:48 »

Hey, Nice piccy John.

Here's one of me and Tom taken around New Year time.



I must say, this is one of the better ones.

Angel

34

Chemistry / Phase and state

« on: 26/04/2004 07:24:51 »

What's the difference between phase and state? And which terminology should be used?

Angel

35

Chemistry / Re: Balancing equations!!!

« on: 23/04/2004 07:41:58 »

I think you will need to know their electrode protential to determine there a spontaneous reaction will occur.

Angel

36

Chemistry / Re: Electrolysis

« on: 22/04/2004 10:45:58 »

Yep very high. About 2000 degrees C. Cryolite (sodium aluminium fluoride, Na3AlF6) act as a solvent in Al2O3 and reduce the melting point to about 1000 degrees C.

Angel

37

Physics, Astronomy & Cosmology / Re: About the Milkyway...

« on: 21/04/2004 11:53:21 »

Wow, seeing the Milky Way with the naked eye. It must be some amazing sight.

Thanks Chris for the explanation.


Angel

38

Physics, Astronomy & Cosmology / About the Milkyway...

« on: 21/04/2004 07:27:57 »

How come we can see the Milkyway using an astronomical telescope when the Earth is actually in the Milkyway?

Of course the 'Milkyway' I'm referring to is the galaxy and not the chocolate bar!

Angel

39

Physiology & Medicine / Re: What causes a fever?

« on: 21/04/2004 07:44:43 »

The heat is produced from the chemical reaction in the body. Normally the body carries out thermal regulation to keep the body temperature at about 37 degrees C. In the case of an infection, the brain increases the set temperature in the body (say 39 degrees), so the body doesn't start cooling down until the internal temperature exceed 39 degrees. And yes this mechanism is body trying to fight the infection.

Chris, please correct me if I'm wrong.

Angel

40

Physiology & Medicine / Re: MCAT exams

« on: 20/04/2004 11:49:22 »

Jay, are planning on doing a medical degree?

Here in the UK, there is a exam called BMAT (don't know what it stands for). Some universities ask prospective undergraduates to take this exam and may make offers depending on the result.

Angel

41

Cells, Microbes & Viruses / Re: How are bacteriophages used as antibiotics, to kill bacteria?

« on: 20/04/2004 11:39:34 »

Russia also have been using phage therapy for ages. If I was diagnosed a serious bacterial infection I would insist on using phage therapy instead of antibiotics treatment.

Angel

42

Physiology & Medicine / Re: A few questions on Circulation

« on: 31/03/2004 12:08:53 »

I would think so. The delay would be very very short.

Angel

43

Cells, Microbes & Viruses / Re: Superflu?

« on: 31/03/2004 11:59:45 »

We've just been talking about MRSA and antibiotic resistance in my biology classes. My teacher said that bacterial infections are actually better treated with specific bacteriophages. And even if the bateria became immune due to mutation the phage will also change to keep up with the bateria. She also said that phage therapy actually have been used by the Russians for a long time! How come we don't have phage therapy here in the UK or in the US?

Angel

44

General Science / Re: Question of the Week - Old Version

« on: 17/03/2004 13:40:39 »

I found something on the Internet which might be what we're looking for.

Why are there 7 days in a week?

One month is roughly the time taken for the Moon to rotate the Earth once. One year is 365 days and divide this by 12, we get 30.416 days per month. One week is the time taken for the Moon the a quarter of the Earth. So divide 30.416 by 4, we get a value around 7.

I'm not sure anout the second question but I'll have a go.
Monday is named after the Moon and since ancient people use the movement of the Moon to measure time (Chinese Calender is based on this), Monday is set to be the first day of the week.

Angel

45

Physiology & Medicine / Re: What is an itch ?...and why are Yawns contagious ?

« on: 15/03/2004 08:29:36 »

Neil, the photos are great. Although I doubt some of the pictures (they are just opening their mouth but not actually yawning)

Angel

46

Physiology & Medicine / Re: How are Dominant and Recessive Genes different ?

« on: 12/03/2004 19:32:24 »

Oh right....and thanks Jay for the explanation.

Angel

47

Physiology & Medicine / Re: How are Dominant and Recessive Genes different ?

« on: 12/03/2004 12:33:17 »

The cells don't know which gene they will inherit. We cannot be certain which cell will have which gene, we only know the probability of a cell having a certain gene.

Angel

48

Physiology & Medicine / Re: What is an itch ?...and why are Yawns contagious ?

« on: 12/03/2004 12:22:49 »

quote:Originally posted by neilep@dsl.pipex.com

Sorry people to bring up this topic again....but I just had an itch and now I want to know why does it feel sooooooooooo good to scratch em ?!!!!, what is happenning to give such a wonderful reward ?.....oh yes indeedy, it was a great scratchy and the pleasure was eye wateringly wondrous !!!!!!!....I think this topic deserves serious consideration as scientifically I'm sure there's someone who could write a paper on it, I'm positive it would be required reading at all educational institutes.

'Men are the same as women...just inside out !'

I think people like to scratch the itchy areas because this action mix up the sensation impulses which the brain are receiving. When you scratch, the brain detects the feeling of scratch and forgot about the itch. This is a bit like rubbing your head after you accidentally bumped into a wall .

Angel

49

Physiology & Medicine / Re: fish oil and other supplement overdose

« on: 12/03/2004 12:08:22 »

1 capsule = 525mg

And the amount for vitamin E and calcium is actually 1 tablet each, I've corrected the post.

Angel

50

Physiology & Medicine / fish oil and other supplement overdose

« on: 10/03/2004 10:43:20 »

My mom is asking about the amount of fish oil capsules, vitamin E and calcium you can have in one day. Is it OK to take one capsule of fish oil + 1 tablet of vit. E + 1 tablet of calcium per day?

Angel