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phasevelocity

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Posts posted by phasevelocity

  1. Project ideas

     

    Consider this:

    Bonnie Bassler: The secret, social lives of bacteria

     

    Research the usage of epigenetics in the bacteria that make up 99% of the DNA in our body.

     

    Alternative:

    Chemical communication between different kinds of these bacteria in our body. Some of them "talk"not with their own kind but with a completely different species. In this field a lot is still unknown.

     

    Or:

    Research how this type of chemical communication works related to the transition from single celled life to multicellular life. For example in lifeforms that life both single celled and in multicellular forms like myxobacteria.

     

    It seems that there is still a lot to learn about how those weird myxobacteria work:

    http://iopscience.iop.org/1478-3975/1/3/005/

    http://www.pnas.org/content/102/32/11308.full

  2. What does cytokinesis mean? What happens during cytokinesis?

     

    The first phase of mitosis is the prophase.

    Metaphase is the longest phase in mitosis.

     

    During cytokinesis the cytoplasm is divided by the construction of a contractile ring around the middle of the cell. This ring narrows and a cleavage furrow appears and grows inward. When it completes and there also are septin filaments beneath the cleavage furrow the cell does the actual division. After that the microtubules used in the mitosis process are reorganized back into the cytoskeleto and the cell is back in the normal interphase.

     

    Plant cells do not use a contractile ring or a cleavage furrow during cytokinesis.

    Plant cells instead create a cell plate.

     

    More info on cytokinesis:

    http://www.ncbi.nlm.nih.gov/books/NBK26831/

  3. So, I am a freshman in highschool, and I have this theory. But I need someone WHO KNOWS WHAT THEY ARE DOING, to test this for me, or find flaws. Please have an open mind.

     

    Okay, so take a pencil. Place it in front of you. Now, divide the pencil in half, divide one of the half's by half, and so on and so on. Do that about 8000mil times. You just keep dividing and dividing. There is NO end to the dividing. You can divide the lines forever. This is (what I believe) the meaning of "Infinity". There is no end, and we can not even began to comprehend it. So take this infinity, and take the odds THAT ARE POSSIBLE. For instance, the odds that you will grow a giant bird wing and fly, is 0/0. Humans can not do that, odds are impossible. Now, take the odds that a bird will dive and hit you on the head. The odds are about 1/100000000000000. But, there IS an odd. If infinity, is forever, than it has all the outcomes of all POSSIBLE odds. So is it possible that, if you keep on dividing the line, (or pencil), sense all the odds get opened up, there could be universes. Is that what our universe is? Just something tiny in something else. And it keeps going, it does not have an end, it does not have a beguining, it is infinity. Forever. All of the possible outcomes come true.

     

    Or, if this is also already a theory, (which if it is, I am not aware), please give me the name of it so i can began to study it.

     

     

    Thank you!

     

    -Matt

     

    (sry for any misspells,i dont have alot of time!)

     

    Your problem is a very old idea and already known since at least ancient Greece.

     

    Please take a look at this wiki page on Zeno's Paradoxes:

    http://en.wikipedia.org/wiki/Zeno%27s_paradoxes

     

    The problem has physical limitations in that you will have to stop dividing when you come to the scale of atoms or molecules.

    If you disregard that you will be limited by what can be observed which is at least 10 magnitudes larger than the smallest scale.

    Ultimately you will be limited by the smallest scale science currently thinks exists fundamentally, the Planck scale or 1.616252×10−35 m.

    More info here:

    http://en.wikipedia.org/wiki/Planck_scale

     

    If you go even further and disregard all practical and physical limits you will encounter logical problems.

    At present the majority of logicians, philosophers and mathematicians regard infinities outside of concepts in math like for example in set theory as impossible.

    The distinction needs to be made between conceptual infinities and real infinities.

    Real infinities are officially termed actual infinities:

    http://en.wikipedia.org/wiki/Actual_infinity

     

    All this would not stop you from considering the future as an infinity.

    Such infinities however are not actualized yet so they are called a potential infinity.

     

    Some people consider God an actual infinity (also called the absolute infinity) while others consider the infinity related attributes of God proof for His non-existence.

     

    Some links related to infinity that may be of interest that might keep you busy for a while:

     

    http://en.wikipedia.org/wiki/Hilbert%27s_paradox_of_the_Grand_Hotel

    http://en.wikipedia.org/wiki/Supertask

    http://en.wikipedia.org/wiki/Balls_and_vase_problem

    http://en.wikipedia.org/wiki/Finitism

    http://en.wikipedia.org/wiki/Infinitesimal

    http://en.wikipedia.org/wiki/Hyperreal_number

    http://en.wikipedia.org/wiki/Surreal_number

    http://en.wikipedia.org/wiki/Transfinite

    http://en.wikipedia.org/wiki/Galileo%27s_paradox

    http://en.wikipedia.org/wiki/Cantor%27s_paradox

    http://en.wikipedia.org/wiki/Burali-Forti_paradox

    http://en.wikipedia.org/wiki/0.999...

    http://en.wikipedia.org/wiki/Aleph_number

    http://en.wikipedia.org/wiki/Axiom_of_limitation_of_size

    http://en.wikipedia.org/wiki/Dedekind-infinite_set

    http://en.wikipedia.org/wiki/Euclid%27s_theorem

    http://en.wikipedia.org/wiki/Russell%27s_paradox

    http://en.wikipedia.org/wiki/Skolem%27s_paradox

     

     

    Note that nature is considered fully consistent. That is the basis of all knowledge.

    If a paradox exists it has to be caused by problems in man-made concepts (or axioms in mathematics).

    This means paradoxes must be analyzed by trying to find the problem in the definitions or concepts.

    The chicken and the egg problem for example is caused by the concept chicken.

    The concept chicken is something practical for humans but in nature lifeforms exist in a constantly changing form.

    Through many steps of gradual change transitions are made so there never is an exact point where the first chicken appears, the bird just became more and more chicken like.

    The paradox appears when we create a concept that sets an artificial boundary called chicken.

     

     

  4. Are they known to be endosymbionts, then (as opposed to unusual organelles)? Although I never heard anything about the DNA within chloroplasts, I *do* know that the mDNA is totally distinct from the human genome. That said, at the time, it wasn't known that the DNA was definitively of bacterial origin. This easily could have been demonstrated, as I learned about that being a hypothesis a looooooong time ago.

     

    In the other thread, the term "nested" wasn't used. Didn't know that it required a third player. Thanks for the correction :).

    The mRNA (it is RNA not DNA) is distinct form nuclear DNA because evolution has weeded out most of the access redundant mRNA and has even moved most of the mRNA that does not need to be at the mitochondrial location to the nucleus. So most genes coding for mitochondrial proteins are now in the nucleus.

     

    Chloroplast RNA is called plastome.

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