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  1. K

    Bio in the news (journal articles)

    check out
  2. K

    Sensory adaptation, how exactly does this occur, also @mtc1973?

    Until then, #1 Threshold potential is the same, but the stimulus will have to be greater to achieve threshold, because there is inhibition. #2 Check out the ball and chain model of sodium channels. It is literally a ball and chain domain that acts to block the channel. #3 It happens very...
  3. K

    Spiking neuron models (ion current models)

    I cant see how the pumps are included mathematically. But they fit the description "intrinsic" "passive" and "global" so I thought I'd mention it. "What came first, the coupling constant or the current?"
  4. K

    Spiking neuron models (ion current models)

    In the Kavasseri paper, I thought it was interesting that by making the coupling term (gs) greater than .5875, the neurons will fire, even when Iext=0. I had trouble visualizing where gs fits in to a natural system. I think that it relates to things like width of synaptic cleft and density...
  5. K

    How to affect action potential

    I dont know anything specifically about planaria in regard to the resting potential of their neurons, but I'm guessing it's on the order of milli-Volts. Voltage clamping is one technique that is exactly the kind of electrical stimulus you're talking about, or what I think you are trying to say...
  6. K

    Biology research - do ppl have to argue for how relevant+interesting it is?

    I'm still an undergrad, but from what I've seen, biological research is often motivated by health concerns, or with health related goals in mind. That is where tons of grant money comes from, when you are able to link research to possible health related benefits. So like you said, who cares...
  7. K

    Manganese toxicity

    I've done a bit of reading about manganese toxicity recently, and I was just wondering if anyone had anything to contribute about this topic. It seems evident from the research I've read that excess manganese (ingested or inhaled) is linked to problems in the nervous system similar to...
  8. K

    What if one species evolve throughout time without interruption?

    As I see it, you envision an environment that is truly stable and occupied by ONE species. Will this species evolve intelligence? Possibly, in time, but it is just one possibility out of many. Consider this though; What if the original species (think humans) is already a sexually reproducing...
  9. K

    Enzymes contribute energy to a reaction?

    Man I just flipped through my copy of "Principles of Biochemistry" by Lehninger et. al. and it appears very vague concerning the actual contribution of energy from enzymes to catalysis. What it does say (and what you probably already know) is that enzymes bond to the substrate to from an...
  10. K

    Why do apes believe in God?

    I'm sorry, I've never heard of Goedel before, and I can't quite grasp what the wikipedia is trying to say about incompleteness theorem. But how does that, "not allow for infinity within the human mind"? Are you saying that Goedel somehow proved we cannot comprehend infinity with a proof? Even...
  11. K

    Organic food is a topic for pseudoscience?

    Alchemy is a classic pseudoscience. Lots of material I imagine. Actually I second the Hollow Earth Society.
  12. K

    Why do apes believe in God?

    This needs to be moved to cultural studies or something, a worthy discussion of "How the idea of a higher being came about and evolved" could be had, and the aspect of biology could be worked in, but right now this thing is riding off generalizations and analogies. Anywho, my 2cents before...
  13. K

    Why do apes believe in God?

    I cant decide whether to write a book about it, or just give you scientific explanation. Now I'm stuck in purgatory-
  14. K

    Shape of the action potential

    Do our neurons care? I'd like to hear that discussion in full, but I'll just say yes, they do care and God created apoptosis for the ones who dont... Just to warn you, I have limited knowledge of the subject, (not familiar with Morris Lecar Model) but from how I understand it you are asking if...
  15. K

    Evolution? Good Discussion here

    reply@the3nigma - Yeah I apologize, that was not my intention. 3am after a long night was not a considerate time to post on my part. I have reread your posts, and the abstracts I linked. Evidence that random mutations surviving in the genepool are rare even in single celled organisms and mostly...
  16. K

    Evolution? Good Discussion here

    Gah, :confused: read more. quit confusing me, and try not to insult people please, we are here to learn. Get your facts lay them them straight. 10 minute search =
  17. K

    Evolution? Good Discussion here

    Yeah I'm interested to hear what you have to say. Send me a message with your argument please.
  18. K

    Biotechnology and bioluminescence

    Man that's an awesome idea. The only problem I can think of is that most bioluminescent molecules require some form of chemical energy to light up, so you would have to engineer that "power source" into the tree. It could be something simple like routing sugar to the area of luminescence, but...
  19. K

    How to defeat this anti-evolution argument?

    Here's my logic, [Microevolution=A] [Macroevolution=B] [Wolves to dogs=C] If A then B A=C C Therefore, B, Evolution. KapowLOL
  20. K

    Anode break excitation good informative video. old school for the win :rofl:
  21. K

    ATP Isolation, Injection, Issues.

    Excellent, thank you for the responses. My interest in the topic is general. I know of adrenaline injections, somehow went laterally with that and started thinking about ATP injections, and then decided to follow through and find answers to my questions. As usual, found a couple answers and...
  22. K

    ATP Isolation, Injection, Issues.

    Ah thank you. If their selling it in a bottle it must be stable. It's much easier to search for something once you know what it is you're searching for -...
  23. K

    Anode break excitation

    I found a good description here - My understanding is that while the anode is on it causes hyperpolarization, turning off the anode (a break in the stimulus) causes a depolarization rebound that triggers the action potential
  24. K

    What's your area and level of expertise?

    MCD Biology, undergrad senior. PF is great. Guilt-free procrastination before studying :tongue2:
  25. K

    ATP Isolation, Injection, Issues.

    Bear with me if you notice any botched ideas in my writing, I'm working on it. Initially I was wondering about direct injection of ATP. But I ran into a roadblock... First - Is it possible to isolate ATP from a source and make a high concentration ATP solution or even pure ATP? (extraction...
  26. K

    How do we perceive time?

    from the article "At the level of the behaving animal, experiments in monkeys have shown that posterior parietal neurons can encode signals related to the perception of time. Neurons in lateral intraparietal area (LIP) seem to represent the passage of time relative to a remembered standard...
  27. K

    How do we perceive time?

    to add, and reinforce the neurological evolutionary aspect, "...the collection of neural structures that comprises the hippocampal formation in the medial temporal lobe..," play an important role in perception of time. from an article found at 'Integrative Psychological and Behavioral...
  28. K

    Which is more sensitive: eye or fingertips?

    Fingers are more sensitive to mechanical touch. Eyes are more sensitive to the touch of photons. Evidence for fingers being more sensitive because a larger part of the brain affects them, "one can see that the hands have a disproportionately large representation compare to the eyes with...
  29. K

    How do we perceive time?

    relative to how fast your going :)
  30. K

    Secretory vesicles

    Mainly. Secretory vesicles are a more specific class of Vesicles in general. You can count on vesicles holding and transporting various molecules around. *** Note that Vesicles can perform other function in the cell besides transport "Vesicle- A bubble-like membranous structure that stores...