Recent content by Pharrahnox

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    Transcription in DNA

    The way I learned it in my Biology course was by referring to the strands as complementary and template strands. The template strand is the non-coding strand - template is a more intuitive way of thinking of it (for me, anyway). The complementary strand has a base sequence that is complementary...
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    Why catalysts affect forward and reverse reactions?

    Ok, that makes sense. Thanks for your help.
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    Kinematics problem

    Actually, I would steer away from saying that you are accelerating. It could cause confusion. I believe the best definition for the OP is that the NET acceleration is zero, acceleration is a change in motion, because the forces cancel out, hence dv/dt (change in velocity over change in time) is...
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    Enhancing the Human body

    Sure you could. It would take a lot of work though, and probably more understanding than we currently have of how the human body works on a cellular and molecular level (as far as I'm aware, anyway). You would have to "program" the appropriate cells to actually incorporate larger amounts or iron...
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    Kinematics problem

    The the action reaction pair is gravity acting on m1 by m2, and the gravity acting on m2 by m1. A rule (not sure if it's actually a rule) that I have found very useful for Newton's 3rd Law is that the action reaction forces must be of the same type, i.e. gravitational and gravitational. The...
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    Why catalysts affect forward and reverse reactions?

    Thanks Vagn and Borek for your prompt replies. I guess I am just incorrectly visualising the "shape" of the active site, and how it bonds with the substrate, whether that be the reactants or products of a particular reaction. It seems strange that an enzyme could not be manufactured to have a...
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    Secondary cell

    In my Year 12 Chemistry course, we learnt that primary cells differ from secondary cells, in that in primary cells, the products of the discharging reaction are used up in side reactions. This is to shift the equilibrium constant to favour the discharging reaction, so the battery will last...
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    Why catalysts affect forward and reverse reactions?

    Based on the very basic understanding on enzymes I have gained from Year 12 Biology and Chemistry, I don't undesrtand why the enzymes specific shape also helps the reverse reaction. I guess my trouble would be due to the simplified diagrams I've seen from Biology, where only the forward reaction...
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    Transformer for a power supply

    Even if it is only to demonstrate the principle practically, I still believe it to be worth a few minutes. I will use many of turns if it increases the efficiency. I assumed that it would, but wanted to be sure. For most purposes, I wouldn't overly care about having fairly precise voltage...
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    Transformer for a power supply

    Thanks for your words of caution, and I'm aware of the dangers of electricity - not first hand experience, just research. I'll definitely use the "Single Hand Technique", especially when experimenting. I just measured the actual voltage from the power point; it's 247V. What would be a good...
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    Transformer for a power supply

    Thanks for the link. That looks quite promising. I may get that, depending on the shipping cost for an overseas 2kVA variac. I would prefer having variable voltages. What I mean by the 5W transformer is just something I can easily build to give whatever voltage I want, and that is safe to use...
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    Transformer for a power supply

    I agree, it probably isn't worth the hassle. I have possibly found the answer. I have found variable transformers online that can deliver even higher powers at lower costs. I am aware that they aren't isolated, and I will research safety precautions in the case that I do purchase one...
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    Transformer for a power supply

    Thanks for the offer, but I'm down towards the bottom of Victoria. I had a look at DigiKey, Element14 and Mouser, but the 300VA 60V transformers all cost >= $100. I could almost buy another Yihua 605d for that much... I have looked up how to build a transformer a bit. I found this site ...
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    Transformer for a power supply

    I am going to make a power supply. I understand the smoothing capacitor and the full-wave bridge rectifier. I am trying to make a 60V, maybe 10A power supply - maybe only 5A, but I would prefer 10A. I don't have a transformer for it, though. I have researched a fair bit on transformers...
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    Multi-layer magnet with seperate coils

    Thankyou for the links. I am using a DC current from a capacitor bank, and I have found a formula for the frequency: f = \frac{1}{2∏\sqrt{LC}} For my coil, it would be something like, C = 0.15F, L = 680μH, which would give a frequency of about 16Hz. Since the frequency is so low, I won't...
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