Lecture2 Bacteria and VirusesA

Lecture2 Bacteria and VirusesA - Bacteria and Viruses...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Microbs Bacteria and Viruses Microbs Bacteria are microscopic, single-celled organisms. Thousands of different kinds of bacteria live throughout the world. Some live in the environment, and others live on the skin, in the airways, in the mouth, and in the digestive and genitourinary tracts of people and animals. Only a few kinds of bacteria cause disease. Microbs Microbs Microbs Microbs
Background image of page 1

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

View Full DocumentRight Arrow Icon
Microbs Microbs Microbs Microbs Phage particles (arrowed) of phiCPG1 attached to an elementary body of C. caviae. [Electron micrograph courtesy of Dr Patrik Bavoil modified from: Hsia, R-C. et al., (2000). Microbes and Infection 2, 761 - 772]. Microbs White blood cells ingesting bacteria Microbs Small Microbes Antoni_van_Leeuwenhoek
Background image of page 2
Microbs "No more pleasant sight has met my eye than this of so many thousands of living creatures in one small drop of water. .." - Stated after his discovery of the microscopic world over three centuries ago. Microbs Microbs 2008 Microbs First-ever estimate of total bacteria on earth Study shows far greater numbers than ever known before. provided by University of Georgia The group, led by microbiologist William B. Whitman, estimates the number to be five million trillion trillion that's a five with 30 zeroes (5 30 )after it. Look at it this way. If each bacterium were a penny, the stack would reach a trillion light years. These almost incomprehensible numbers give only a sketch of the vast pervasiveness of bacteria in the natural world. Microbs Numbers of Insects (Species and Individuals) It has long been recognized and documented that insects are the most diverse group of organisms, meaning that the numbers of species of insects are more than any other group. In the world, … At any time, it is estimated that there are some 10 quintillion (10,000,000,000,000,000,000) individual insects alive. Microbs
Background image of page 3

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

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 03/12/2012 for the course BIOL 0126 taught by Professor Wux. during the Winter '11 term at HKU.

Page1 / 8

Lecture2 Bacteria and VirusesA - Bacteria and Viruses...

This preview shows document pages 1 - 4. Sign up to view the full document.

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