PSYB64H3 Chapter Notes - Chapter 1: Microtome, Myelin, Godfrey Hounsfield
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Formalin not only hardens the tissue, making it possible to produce thin slices, but it also preserves the tissue from breakdown by enzymes or bacteria. Electron microscopes require slices of less than 1 micrometre: even when fixed and mounted on slides, nerve tissue would appear nearly transparent under the microscope if it were not for a variety of special stains. It can provide images taken at any angle without any movement of the individual. In contrast, the skull bones and tissues allow magnetism to pass through without any reduction: mush faster than fmri or pet, providing moment-by-moment picture of brain activity. In contrast, the concordance rate for identical twins in regard to major depressive disorder is usually reported to be about 40%, this indicated that environmental variables play a more significant role in depression than in bipolar. I(cid:373)porta(cid:374)t to re(cid:373)e(cid:373)(cid:271)er that (cid:862)e(cid:374)(cid:448)iro(cid:374)(cid:373)e(cid:374)tal (cid:448)aria(cid:271)les(cid:863) * (cid:373)ight still include biological components such as prenatal environment and exposure to infection.
