MICB 201 Lecture Notes - Lecture 22: Rumen, Cellulase, Digestive Enzyme
Document Summary
Chapter 11: bacteria (and archaea) on the farm (continued) We (cid:272)a(cid:374) hook a (cid:272)o(cid:449)"s digesti(cid:448)e s(cid:455)ste(cid:373) up to a (cid:271)ag a(cid:374)d (cid:272)olle(cid:272)t its (cid:373)etha(cid:374)e. One cow produces enough combustible methane to power a refrigerator for 24 hrs. Fistulas (cid:862)portholes(cid:863) se(cid:449)(cid:374) i(cid:374) to the sides of cows: used to study digestive processes in living animals (invented in canada) (cid:862)ellie(cid:863) Rumen: anaerobic digestive compartment containing high populations of diverse microbes eg. bacteria, archaea, eukaryal protozoa. Cows satisfy most of their nutritional requirements indirectly by: absorbing the waste products of their rumen microbes, digesting their rumen microbes and absorbing the digestion products. Energy and electrons: cellulose is degraded to glucose by extracellular cellulases produced by some rumen heterotrophs, most glucose is not a(cid:271)sor(cid:271)ed i(cid:374)to the (cid:272)o(cid:449)"s (cid:271)lood. Major bioelements: c, n, s, o, p, h: cows not only need energy and electrons, they also need the major elements for anabolism (biosynthesis, a (cid:272)o(cid:449)"s (cid:373)ajor a(cid:374)a(cid:271)oli(cid:272) task is to make protein.
