2 - PROKARYOTIC DIVERSITY BIOL 4125 SPRING 2009 LECTURE 2 Diversity the past Notable Milestones in Microbiology Year 1676 1799 1861 1866 1883 1887

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon
PROKARYOTIC DIVERSITY BIOL 4125 SPRING 2009 LECTURE 2 Diversity: the past
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Notable Milestones in Microbiology Complete sequence of a bacterial genome 1995 Kary Mulis invents the PCR…while driving down the road 1985 James Watson and Francis Crick solve structure of DNA 1953 Carl Woese describes archaea and proposes 3 domains of life 1980 Craig Venter uses genome sequencing to examine Sargasso Sea microbiota and identifies 1.2 million previously unknown genes 2004 Martinus Beijerinick characterizes bacterial nitrogen and sulfur transformations; describes his work as “microbial ecology” 1905 Sergei Winogradsky develops the concept of chemoautotrophy 1887 Robert Koch develops method to culture and isolate bacteria 1883 Ernst Häeckel introduces the term ecology 1866 Louis Pasteur demolishes the spontaneous generation theory 1861 Lazaro Spallanzani attempts to disprove spontaneous generation 1799 Antonie van Leeuwenhoek describes bacteria 1676 Event Year
Background image of page 2
Image: http://biology.clc.uc.edu/courses/bio106/bacteria.htm Koch recognized that to link a specific microbe to a disease, it must be isolated in pure culture • Observed that when a solid surface, such as a potato slice, was incubated in air, bacterial colonies developed. • He inferred that each colony had arisen from a single bacterial cell that had fallen on the surface and multiplied. • The colonies had characteristic shapes, sizes, and colors. • When cells from the individual colonies were observed under the microscope, the cells were morphologically different “All bacteria which maintain the characteristics which differentiate one from another when they are cultured on the same medium and under the same conditions should be designated as species, varieties, forms, or other suitable designation.”
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 4
Agar consists of polysaccharides extracted from certain kinds of red algae. It melts at 100 o C and remains molten at temperatures above 45 o C, allowing heat-sensitive nutrients and microbes to be mixed with it. http://www.seaweed.ie/algae/cyanophyta.lasso Koch’s solid media and pure culture technique are integral to the development of microbiology Julius Petri, an assistant of Koch’s, invented a shallow glass dish for the culturing of cells. Modern Petri dishes are constructed out of plastic and disposed of after use.
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 6
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 08/04/2009 for the course BIOL 4125 taught by Professor Christner during the Spring '08 term at LSU.

Page1 / 21

2 - PROKARYOTIC DIVERSITY BIOL 4125 SPRING 2009 LECTURE 2 Diversity the past Notable Milestones in Microbiology Year 1676 1799 1861 1866 1883 1887

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online