Saturday, April 25, 2015

利用闭路生成泛函的连续积分表示推导临界动力学的拉氏场论表述. 随机模型 研究非平衡态统计场论的有效方法 both systems run throughout the body and have a more or less central control unit (the brain and heart respectively).

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由 Z GUANG-ZHAO 著作 - ‎2005 - ‎相關文章
这就是拉氏形式的经典统计场论生成泛函. Martin, ... 8 期周光召等: 非平衡统计场论与临界动力学(H) 971 ... 这就是没有随机力的广义朗之万方程(即TDGL 方程).
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    文献[3—5】中指出,它足研究非平衡态统计场论的有效方法.文献[6】中用它 ... 本文中利用闭路生成泛函的连续积分表示推导临界动力学的拉氏场论表述. 在随机模型中 ...

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    系统可积

    6米阳光

    来自: 6米阳光(love the way you lie,,) 2012-09-30 15:38:39



    Structural evidence for the existence of a symmetrical high energy species in the degenerate vinylcyclopropane rearrangement

    J. Am. Chem. Soc., 1969, 91 (15), pp 4310–4311
     
     

    Relationship between nerves and axons

    I just wanted to get a realistic viewpoint of our nervous system. I understand arteries and veins, but I wanted to know how similar our nervous system is to that?
    I understand we have neurons (please correct me if I am wrong) all over the surface of body. Whenever we feel a touch a neuron fires a response, and that response travels through axons (myelin sheath).
    My main question is what a nerve exactly is. Is it a long axon? How many axons (same thing as neuron body?) are in a nerve? I am sure it depends on different nerves.
    share|improve this question
        
    I vote to re-open - this question is not too broad. On the contrary, it is a set of highly specific questions, basically boiling down to terminology. I edited the question previously when the close-votes were already pouring in, and hence I vote now to re-open without editing any further. I think it is fine as is. Furthermore, there is background info, so there is no ground to 'leave-close' due to homework :-) –  AliceD Feb 17 at 12:36
        
    Thanks for re-opening! –  AliceD Feb 18 at 11:07
        
    I forgot to message you, but I edited your question to make it more compatible with Biology Stack Exchange. At Biology we like clear questions. Nice question +1 –  AliceD Feb 18 at 11:47
        
    Chris, this was my first question on this website. I only knew of one rule and that was to be as specific as possible. I tried. I am not very familiar with the format of this website so I am not sure what "close-votes" or "re-open" you were talking about. I barely found out that my question was answered :) which I really appreciate. –  Jagmeet Singh Feb 20 at 5:48
        
    @ChrisStronks I see a number 4 next to my question. What does that mean? Net positive votes I got? Also, can anyone edit my question? Or do you run this website? –  Jagmeet Singh Feb 20 at 5:49

    1 Answer 1

    I will go through your list of questions below:
    • I wanted to know how similar is our nervous system to [the circulatory system]?
      They are very different, but as in every comparison of very complex systems, there is some overlap. The circulatory system carries fluids, the nervous system electrical signals so they are functionally not alike. However, both systems run throughout the body and have a more or less central control unit (the brain and heart respectively). So there is a structural similarity. I reckon they are as much alike as a city's sewer system and electricity grid.
    • I understand we have neurons (please correct me if I am wrong) all over the surface of body.
      That is correct
    • Whenever we feel a touch (stimulus arises) a neuron fires a response, and that response travels through axons (myelin sheath).
      Tactile stimulation may result in firing of one or more neurons, dependent on the intensity of the stimulus. Larger stimuli will, obviously, recruit more fibers. Stronger stimuli will evoke stronger responses (increased firing). Axons indeed conduct the neuronal responses, like an electrical wire conducts electrical current. Longer axons are often myelinated (insulated). Not all neurons related to touch are myelinated, however.
    • So my main question is that what exactly is a nerve?
      A nerve is a bundle of axons that carry related functional information. Typically, nerves conduct information originating from locations closely located together in the body, and generally they convey this information to a localized spot in the body as well. For example, the optic nerve carries information from the photoreceptors (related information) from the retina (localized source) to the brainstem (localized target).
    • Is [a nerve] a long axon?
      A nerve contains many axons. 'Long' or 'short' is rather subjective.
    • How many axons (same thing as neuron body?) are in a nerve? I am sure it depends on different nerves.
      Neuronal cell bodies are typically located outside a nerve. Nerves contain varying numbers of fibers. For example, the auditory nerve harbors the axons of the spiral ganglion cells that transmit auditory information from the inner ear to the brain. It contains between 31k - 32k (myelinated) fibers in normal-hearing humans (Spoendlin & Schrott, 1989). In contrast, the optic nerve, which carries visual information from the retina to the brain, contains some 1.3 million (myelinated) fibers in young human adults (Jonas et al., 1992)

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