BIO 3308 MICROBIOLOGY.

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Presentation transcript:

BIO 3308 MICROBIOLOGY

Microbial Life: Origin and Discovery Chapter 1 Microbial Life: Origin and Discovery

What will we study? Modules: Introduction, history, microscopy Cell structure and function Growth and development Metabolism Genetics and molecular regulation Human-microbe interactions

What is a microorganism? What is a microorganism (microbe)? Living organisms that can only be seen through a microscope Less than about 1 mm across 10-3 meters (1 mm) to 10-7 meters (0.1 micrometer (micron))

(algae,protists, fungi) What Is a Microbe? Microorganisms Cellular Acellular Viruses Prokaryotic (bacteria, archaea) Eukaryotic (algae,protists, fungi)

Microorganisms-size comparison Prokaryotic cell: 1-3 mm Eukaryotic cell: 15-20 mm Virus: 20-200 nm

The Giants Giant bacterium Giant virus

Prokaryotes vs eukaryotes

Bacteria with a nucleus? Gemmata obscuriglobus

Small but significant? Biomass: 5x1030 cells of prokaryotes Same amount of carbon as plants 10X as much nitrogen and phosphorus as plants Prokaryotes: The unseen majority

Where do we find prokaryotes?

Current issues in Microbiology?

Normal Human Microbiota

Human beings as symbionts ~ number of human cells: 1013 ~ number of prokaryotes on and in humans: 1014

Prokaryotes: The bad, the good Some numbers: Many species of bacteria known (millions?) ~ 170 are pathogenic All bacteria. No archaea.

The human microbiome Human genome vs human microbiome !! http://nihroadmap.nih.gov/hmp/