BLG 144 Lecture Notes - Lecture 11: Pathogenic Bacteria, Germ Theory Of Disease, Bioremediation
27 Apr 2018
School
Department
Course
Professor
CHAPTER 28 BACTERIA AND ARCHAEA
- Tiny in size but large size range
- Ancient, diverse, abundant, and ubiquitous
- Can cause infectious disease and effective at cleaning pollution
- live in every known habitat diverse types of compounds in cellular respiration and fermentation
- simple overall morphology but their biochemistry is extremely sophisticated
- key role in ecosystems, photosynthetic bacteria were responsible for evolution of oxygen atmosphere
-Cycle nutrients through terrestrial and aquatic environment
- form 2/3 largest branches on tree of life. Third branch is eukarya (eukaryotes)
- all unicellular and prokaryotic(lack membrane-bound nucleus)
- oldest fossil found is 3.5 billion years old bacteria
- eukaryotes came in fossil records 1.7 billion years later
- 5000 species of bacteria have been named but there are millions existing
Abundance of Prokaryotes
- 1012 bacterial cells living on skin, 1013 make up your body, 1014bacterial and archaeal cells in
digestive tract
- In terms of total biomass of living material on our planet, bacteria and archaea are dominant life
forms
Habitat diversity of prokaryotes
- Bacteria and archaea can live almost anywhere
Medical importance
- Bacteria that cause diseases are called pathogenic
- Pathogenic bacteria come from many lineages
- They affet tissues at ody’s etry poits like: ouds o ski, respiratory ad gastroitestial
tracts, and urogenital canal
- Robert Koch in late 1800s gave the basis of the germ theory of disease
- Germ theory of disease – infectious diseases are caused by bacteria and viruses( acellular
particles that parasitize cells)
- Koh’s postulates ofir a ausatie lik etee a speifi ifetious disease ad a speifi
microbe
1. The microbe must be present in individuals suffering from the disease and absent from
healthy individuals
find more resources at oneclass.com
find more resources at oneclass.com
Document Summary
Tiny in size but large size range. Can cause infectious disease and effective at cleaning pollution. Live in every known habitat diverse types of compounds in cellular respiration and fermentation. Simple overall morphology but their biochemistry is extremely sophisticated. Key role in ecosystems, photosynthetic bacteria were responsible for evolution of oxygen atmosphere. Form 2/3 largest branches on tree of life. Oldest fossil found is 3. 5 billion years old bacteria. Eukaryotes came in fossil records 1. 7 billion years later. 5000 species of bacteria have been named but there are millions existing. 1012 bacterial cells living on skin, 1013 make up your body, 1014bacterial and archaeal cells in digestive tract. In terms of total biomass of living material on our planet, bacteria and archaea are dominant life forms. Bacteria and archaea can live almost anywhere. Bacteria that cause diseases are called pathogenic. They affe(cid:272)t tissues at (cid:271)ody"s e(cid:374)try poi(cid:374)ts like: (cid:449)ou(cid:374)ds o(cid:374) ski(cid:374), respiratory a(cid:374)d gastroi(cid:374)testi(cid:374)al tracts, and urogenital canal.
