Survival

Taffer said:
I do not understand, please rephrase.
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You asked about who will judge about "nature balance". I told how it can be judged. Although God should be there to judge & take necessary action because it is big issue beyond our capacity but still we can judge by few clues which I thought & told in my last post.
 
Taffer said:
It doesn't, so there is no need to try and understand anything. Cells are autonomous, especially cancerous cells.

ETA: Kumar, I had to through under-grad and grad school before we learned 'everything' about how cells interact. And even then, I do not understand much. Do you really want us to try and explain such complex ideas to you? Do you have any university education in biology, cell biology, genetics or microbiology?
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Therefore I am asking.

Cells esp. cancer cells can be autonomous but still they can be dependant on surrounding environment & signals. They die with the death of host, it suggest they are also dependant on us or on environment signals. Nutrients may not exhausted in many cases esp. accidental but still they die on such death.
 
Lukraak_Sisser said:
A short attempt. Each cell is filled with receptors and transport channels. In response to stimuli from their environment cells can release certain signalling molecules that then make the cells that can recieve these molecules react in a certain way. All of these things are part of a massive action/response interactive network of a complexity that boggles the mind and that runs fully automatically without any active input from the brain.
These continuous checks and balances ensure your skin keeps growing, while your brain does not etc.
The fact that something in that network can go wrong is not that surprising. The surprising part is how *little* it actually malfunctions.

However, and this cannot be stressed enough. This is not a sentient network. It does not think, it has no emotions, it is just a very complex chemical reaction. Thus if something goes wrong there is no consious decision to kill the host, its just a side effect.
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Will above system go on working like it even in brain dead person?
 
Lukraak_Sisser said:
Cancer does not kill by consuming all our nutrients. It kills because in its unregulated growth it will destroy essential organs by literally tearing them apart. Once those are gone the patient dies, and when that happens the cancer becomes starved of nutrients.
That is not a case of being 'better'.
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Thanks it is now clear to me.

Btw, how cancer cells will behave in a brain(may be nervous system) dead person?
 
MRC_Hans said:
No. There are many forms of cancer. Things are what they are, whether they are known or not.

Hans
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I meant cancer cell concept is universely known so it should not be a big issue to understand its definition like of Sun.
 
Kumar said:
Therefore I am asking.

Cells esp. cancer cells can be autonomous but still they can be dependant on surrounding environment & signals. They die with the death of host, it suggest they are also dependant on us or on environment signals. Nutrients may not exhausted in many cases esp. accidental but still they die on such death.
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Excuse me, but that is an extremely stupid question. How is a cancer cell nourished? Trough the blood-stream. When the blood-stream stops, what do you think happens?

Kumar, do try to think for yourself, sometimes.

Hans
 
Kumar said:
Will above system go on working like it even in brain dead person?
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IAMNADBIPOTV

Partially.

Some vital functions do depend on the unconscious parts of the brain. Breathing and I believe heart-beat, too. So the body of a brain dead person will die quickly.

But, yes, AFAIK your cells will be alive for a little while after you die.

And the body of a brain dead person can sometimes be kept alive, too, with a respirator. (Which looks like the heart might actually still be beating all by itself after all.)
 
VIRULENCE
Evolution
According to evolutionary medicine, optimal virulence increases with horizontal transmission (between non-relatives) and decreases with vertical transmission (from parent to child). This is because the fitness of the host is bound to the fitness in vertical transmission but is not so bound in horizontal transmission.

The pathogen population can evolve once it is in the host. There are three main hypotheses about why a pathogen evolves as it does. These three models help to explain the life history strategies of viruses, bacteria, and other pathogens, including reproduction, migration within the host, virulence, etc. The three hypotheses are the Trade-Off Hypothesis, the Short-Sighted Evolution Hypothesis, and the Coincidental Evolution Hypothesis. All of these offer ultimate explanations for virulence in pathogens.
http://en.wikipedia.org/wiki/Virulence

Quorum sensing is a type of decision-making process used by decentralized groups to coordinate behavior. Many species of bacteria use quorum sensing to coordinate their gene expression according to the local density of their population.
http://en.wikipedia.org/wiki/Quorum_sensing
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Above quotes are interesting & relevant to topic.
 
If someone were unethical enough to pump around the blood of a braindead person with cancer, and supply that blood with oxygen and nutrients the cancer will keep growing. Possibly eventually it will destroy the host body to such a degree that even such a system would fail, but doing this violates human morality to such an extent that only the most depraved persons would be willing to perform such an experiment.
 
Kumar said:
Above quotes are interesting & relevant to topic.
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How would you know? You don't understand half the words. Kumar, PLEASE stop posting loose snippings that you don't understand.

You can ask questions, and even if they may be naive, I'm sure people here won't mind answering, but all this googling is just confusing you.

You are like someone who collects random auto parts and demand people build him a car.

Hans
 
Rasmus said:
IAMNADBIPOTV

Partially.

Some vital functions do depend on the unconscious parts of the brain. Breathing and I believe heart-beat, too. So the body of a brain dead person will die quickly.

But, yes, AFAIK your cells will be alive for a little while after you die.

And the body of a brain dead person can sometimes be kept alive, too, with a respirator. (Which looks like the heart might actually still be beating all by itself after all.)
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What about cancer cells, will they die in brain dead person bit early or will die on death of host?
 
Kumar said:
You asked about who will judge about "nature balance". I told how it can be judged. Although God should be there to judge & take necessary action because it is big issue beyond our capacity but still we can judge by few clues which I thought & told in my last post.
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Yes, and I do not understand what you said. Please rephrase what you want to say, don't just point me back to your original post.
 
MRC_Hans said:
Excuse me, but that is an extremely stupid question. How is a cancer cell nourished? Trough the blood-stream. When the blood-stream stops, what do you think happens?

Kumar, do try to think for yourself, sometimes.

Hans
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Yes but in case of slow death nutrients may get exhausted at reducing level, but in case of accidental case, suddenly. Meat of saultered animals look to be more red(I am veg so can mistake).
 
Lukraak_Sisser said:
If someone were unethical enough to pump around the blood of a braindead person with cancer, and supply that blood with oxygen and nutrients the cancer will keep growing. Possibly eventually it will destroy the host body to such a degree that even such a system would fail, but doing this violates human morality to such an extent that only the most depraved persons would be willing to perform such an experiment.
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Thanks. I don't know clearly if you or other member has told me about it;-

Do cancer cells use signaling molecule for Quorum sensing mechnism?
 
Kumar said:
Yes but in case of slow death nutrients may get exhausted at reducing level, but in case of accidental case, suddenly. Meat of saultered animals look to be more red(I am veg so can mistake).
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?? So what? Why do you want to know this in such detail? Does it matter at all?

Since cancer cells are often growing much faster than other cells, it is possible that by starving a patient, the cancer cells may start dying a little faster than the rest of the patient. I don't think there is much research in that field, however.

Hans
 
MRC_Hans said:
How would you know? You don't understand half the words. Kumar, PLEASE stop posting loose snippings that you don't understand.

You can ask questions, and even if they may be naive, I'm sure people here won't mind answering, but all this googling is just confusing you.

You are like someone who collects random auto parts and demand people build him a car.

Hans
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Mostly I use quotes with simple & relevent knowledge. It is good way to express & get expressions. Many people may read & try to put in their language but this can cause some mistakes if poster don't know technical understandins about that article in advance. Techical poster just have to read heading & teach his understandings.
 
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