Biology 3601A/B Lecture Notes - Lecture 5: Antonie Van Leeuwenhoek, Brine Shrimp, Cryptobiosis

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Lecture 5 ion and water balance 5. I examined it, and perceived some of the animalcules lying closely heaped together. In a short time afterwards, they (cid:271)ega(cid:374) to e(cid:454)te(cid:374)d their (cid:271)odies, a(cid:374)d i(cid:374) half a(cid:374) hour at least a hu(cid:374)dred of the(cid:373) (cid:449)ere s(cid:449)i(cid:373)(cid:373)i(cid:374)g a(cid:271)out the glass (cid:859) Anhydrobiosis (cid:858)life without water(cid:859: the ability to dry out completely and rehydrate again, a state of dormancy induced by desiccation, characterized by reduced metabolism and adaptations to low water availability. E(cid:454)tre(cid:373)e e(cid:374)d of the (cid:862)sur(cid:448)i(cid:448)i(cid:374)g losi(cid:374)g (cid:373)ore (cid:449)ater(cid:863) (cid:272)o(cid:374)ti(cid:374)uu(cid:373) Structuring/stabilizing force for macromolecules: the hydrophobic effect, membranes phospholipid bilayers, proteins relying on hydrophobic interiors and hydrophilic exteriors to maintain structure. When cells lose water: when you remove the water in a cell, it dehydrates, and proteins are crammed together, protein aggregation, membrane fusion, molecular crowding. Everything is being crammed together, not only proteins: oxidative stress, no longer have water between everything, more chance of oxygen interactions.

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