BIOS 4630 Lecture Notes - Lecture 2: Trehalose, Hydrogen Bond, Boiling Point
12 Jan 2017
School
Department
Course
Professor
Document Summary
Anhydrobiosis: life without water (example: rotifers, tarigrades, yeast) Strategy in anhydrobiosis (trehalose, a disaccharide): trehalose (a sugar) has a lot of. These oh groups can participate in hydrogen bonds. For example, they can hydrogen bond with proteins to stabilize them in complete absence of water. (cid:862)lesso(cid:374)s fro(cid:373) nature(cid:863) j. h. Properties of water: molecular weight are more or less the same of different compounds ch4, nh3, H20, h2s but they have different: melting point, boiling point, heat of vaporization, water has higher melting point, boiling point, and heat of vaporization. Why: less dense as a solid, has oxygen, it"s polar, it"s (cid:373)ore ele(cid:272)tro(cid:374)egati(cid:448)e, *side note, hydrogen bonds alone are not very strong. But a bunch of hydrogen bonds together are very strong. Hydrophilic molecules (and water: water loving: include a lot of proteins and sodium chloride salt. Hydrophobic molecules (and water: water fearing: various hydrocarbons, oils, etc, water forms clathrate structures around hydrophobic molecule such as methane (cage- or ice-like)
