no teacher today, so did a bit of reading on my own.
genetic therapy is used to replace or correct genes that express negative traits.
it is mostly used for cancer cells, but can also be used to treat infectious diseases and hereditary diseases such as cystic fibrosis.
i was wondering how they go about inserting the genes to multiple cells, or if they insert it to one. it's quite genius actually, it's called trans.. something (LAWL i'll check later) and they use viruses to spread the new gene to other cells.
genius really.
Monday, August 23, 2010
phys (0823) - Med: spin moment
and with this, i make my triumphant return to note blogging.
so to begin with.. MRI stands for Magnetic Resonance Imaging, and it produces high resolution images.
it works on the basis of strong superconductors, they produce an immensely strong magnetic field (x30000 that of earth and x200 that of a fridge magnet) which is why hazards involved with MRI are caused by metal objects int he room (eg chairs) or if patients have metal plates in their body
alright so here we go:
atoms make up our body, and each atom is composed of smaller charged particles, which are constantly spinning. this spin creates a magnetic field along the axis (right hand grip rule), the spin moment.
in each nucleus, there are protons and neutrons, and this can occur with both. in an atom with an even amount of protons, the magnetic fields will cancel each other out (they face opposite directions because it is energetically favourable) in an atom with an odd number, they all pair up, the remaining field is the net magnetic field. (mind you this occurs with neutrons as well, but they cannot pair up with protons)
now usually, all the net magnetic fields go off in different directions, but when placed in the superconductor magnetic field, they mostly all align in the same direction, at a slight angle, and it rotates in the direction of its axis around the magnetic field, ie. it precesses.
err yeah i think that's all for now on that.
so to begin with.. MRI stands for Magnetic Resonance Imaging, and it produces high resolution images.
it works on the basis of strong superconductors, they produce an immensely strong magnetic field (x30000 that of earth and x200 that of a fridge magnet) which is why hazards involved with MRI are caused by metal objects int he room (eg chairs) or if patients have metal plates in their body
alright so here we go:
atoms make up our body, and each atom is composed of smaller charged particles, which are constantly spinning. this spin creates a magnetic field along the axis (right hand grip rule), the spin moment.
in each nucleus, there are protons and neutrons, and this can occur with both. in an atom with an even amount of protons, the magnetic fields will cancel each other out (they face opposite directions because it is energetically favourable) in an atom with an odd number, they all pair up, the remaining field is the net magnetic field. (mind you this occurs with neutrons as well, but they cannot pair up with protons)
now usually, all the net magnetic fields go off in different directions, but when placed in the superconductor magnetic field, they mostly all align in the same direction, at a slight angle, and it rotates in the direction of its axis around the magnetic field, ie. it precesses.
err yeah i think that's all for now on that.
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