21

Physiology & Medicine / Why do human lips look red ?

« on: 26/08/2004 18:09:58 »

what cause the lips red and why do the lips get black in smokers.

22

Physiology & Medicine / What is allosteric control of enzymes ?

« on: 02/08/2004 19:42:28 »

what are allotropic modullators regarding the enzymes that brings about the conformational changes in the active site of enzymes.

23

Physiology & Medicine / enzyme production

« on: 25/07/2004 11:54:06 »

can an enzyme help in the production of another enzyme??

Are the secondary messengers like cAMP enzymes and if they are enzymes then how can we say that these are enzymes when they dont have pretein in their structures.

24

General Science / burning of oxygen

« on: 27/07/2004 11:52:58 »

if there is fire on an oxygen cylinder what will happen will it burn spontaneously or gradually just like normal methane gas.

25

Physiology & Medicine / heart diseases ??

« on: 04/07/2004 00:21:47 »

well does anybody has any idea about how infarction happens and how can we diagnose it while looking on ECG ,and what are arrythmias and ischemia.

26

Physiology & Medicine / Damaged nerve.

« on: 01/07/2004 17:27:05 »

can a damaged nerve be repaired?? well what i know about the body nerves is that they have schwan cells which help the damaged nerves repaired but the nerves or neurons of the brain dont have the schwan cells so they cant be repaired so my question is that is there any way to repair the damaged nerves which dont have the schwan cells.

27

Physics, Astronomy & Cosmology / How do I create a vacuum?

« on: 03/07/2004 23:40:57 »

Can i create a vaccum in a sealed jar with my vaccum cleaner.

28

Physiology & Medicine / How does caffeine in tea or coffee affect heart rate?

« on: 01/07/2004 17:31:52 »

3,5-cAMP produced in the heart by the effectors (adenylate cyclase) of adrenergic receptors is inhibited to 5-AMP by a reaction with phosphodiesterase this also occurs by caffine and theophylline which are chemically methylxanthines and are present in tea and coffee so what will their effect be on heart rate witll the heart rate increase or decrease.

29

General Science / Are spices harmful to the body?

« on: 01/07/2004 00:54:43 »

many ppls cant eat spicy food they get their GIT problems why and is there any harmful effect of spices.

30

Physiology & Medicine / increased heart rate

« on: 01/07/2004 17:44:52 »

During muscular exersise why the heart beat increases and why the venous return is high is it because :
The more pumping of blood is required to fulfil the oxygen requirment or Is it due to the dilation of blood vessels.

I am a bit confused in it.

31

Just Chat! / anyone who thinks that he/she is a scientist

« on: 02/07/2004 00:42:36 »

well is there anybody who is a scientist or who thinks that he is a scientist and is doing his/her own research please report here.

32

Physics, Astronomy & Cosmology / power generator

« on: 01/07/2004 18:33:08 »

can anybody help me in making a power generator at home on small scale.

33

Physics, Astronomy & Cosmology / grand unification theory (GUT)

« on: 02/07/2004 00:46:00 »

i dont know much about this theory can anyone send me the link or some details about this theory.

34

Chemistry / safety measures to prevent from radioactivity

« on: 01/07/2004 10:19:52 »

how to prevent ourselves from the radioactivity in our homes i mean if we want to do some experiment on radioactive elements at home how can we protect ourself from radiations.

35

Physiology & Medicine / improving memory

« on: 01/07/2004 22:08:40 »

how could i increase my memory coz all what i study after sometimes i forget everything i mean after a few days. Is there any way i can improve it.

36

Physiology & Medicine / artificial pacemaker

« on: 01/07/2004 17:41:59 »

is there any artificial pacemaker which sends rythmic electrical impulses to the heart.

37

Physiology & Medicine / How does the heart form a new pacemaker when the sino-atrial node is damaged?

« on: 01/07/2004 17:40:06 »

If SA node is experimentally destroyed or stop generating impulses due to disease then the pacemaker appears in some other region of the atria especially at the junction of atria with the AV node. I want more explaination on how a different pacemaker is formed.

38

Physics, Astronomy & Cosmology / Does gravity have an effect light?

« on: 01/07/2004 01:11:53 »

does the gravity effects on light and if not than why light didnt return from the black hole and as the gravity of black hole has too much gravity that it can compress the whole of the space ship to a single cell.

39

General Science / The fourth dimension

« on: 24/06/2004 14:23:51 »

Beside the third dimension there is another dimension the fourth one which according to Einstein was the time factor beside the X,Y and Z, there are some scientist who said that the dreams which we used to see is in 4th dimension so i was attendind a workshop named as "The mind power in 4th dimension" and that was a very great workshop in which he told the ppls that if we are in alpha brain state then we can think in 4th dimension and we can see and experience some super natural things he make us do this but as you know that a little logic makes the person out of alpha state to beta.

My question is to the ppls who are here to tell me any way so that i can go in alpha brain frequency to access my subconsious and unconscious

40

General Science / surfcace tension in oceans

« on: 30/07/2003 19:56:31 »

There are adhesive forces in the water which attracts the water molecules from all sides so the molecules of the surface dont have any molecules above it so it is pushed downwards and miniscus is formed. So same things happened in oceans and the water in the ocean is not therefore in straight level but in cup shaped. That is why waves dont comes straightly to the shore.